Quantum many-body physics: Strongly correlated electron physics
Strongly correlated electron physics at Hasan lab: Quantum many-body physics in doped Mott insulators, Charge-order and Superconductivity competition, Nematic order & fluctuations etc.
Hasan et.al., Phys. Rev. Lett. 92, 246402 (2004); Phys. Rev. Lett. 96, 046407 (2006); Phys. Rev. Lett. 97, 186405 (2006); Phys. Rev. Lett. 96, 216405 (2006). Phys. Rev. Lett. 98, 117007 (2007) and Phys. Rev. Lett. 99, 167002 (2007). Phys. Rev. B 78, 184508 (2008); Phys. Rev. Lett. 103, 037002 (2009). Nature’18, NaturePhys’19, PRL’19, PRL’20, NatureCom’20a, NatureCom’20b, NatureCom’20c, Nature’20, NatureMat’21, PRL’21, Science’19, Nature’19, Nature’22a, Nature’22b, PRL’22, NaturePhys’22, NatureCom’22, NatureCom’23a, NatureCom’23b, NaturePhys’23, NatureCom’24a, NatureCom’24b, NatureCom’24c, NatureMat’24, NaturePhysics'25
Theoretical Predictions of Topological Materials by Hasan group
Theoretical Predictions of Topological Materials (Hasan group publications):
Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class (Bi2Se3 class) with spin-polarized single-Dirac-cone on the surface,
https://arxiv.org/abs/0908.3513 (2009)
(Theoretical Prediction of Weyl semimetals in 2012)
“Topological Electronic Structure and WEYL Semimetal in the TlBiSe Class,” Physical Review B 86, 115208 (2012).
(Theoretical Prediction of ) “New Type of Weyl Semimetal with Quadratic Double Weyl Fermions,” Proc. Natl. Acad. Sci. 113, 1180 (2015).
(Theoretical Prediction of ) “A Weyl Fermion Semimetal with Surface Fermi Arcs in the Transition Metal Mono-pnictide TaAs Class,”
Nature Commun. 6:7373 (2015).
"Room-temperature Magnetic Weyl Semimetal and Nodal Line Semimetal States in Co2TiX (X=Si, Ge, or Sn),"
https://www.arxiv.org/pdf/1604.02124v1 (2016)
"Theoretical Prediction of Magnetic Weyl Semimetal States in the R-Al-X Family of Compounds" Physical Review B 97, 041104 (2018)
(Theoretical Prediction of ) Topological Hopf and Chain Link Semimetal States and Their Applications.
Physical Review Letters 119, 156401 (2017)
(Theoretical Prediction of ) "Topological Quantum Properties of Weyl Chiral Crystals,"
Nature Materials 17, 978-985 (2018).
“Topological Invariants measured precisely and decisively without resorting to transport methods” RMP 82, 3045 (2010))
“Topological Invariants measured precisely and decisively without resorting to transport methods” RMP 82, 3045 (2010))
Selected Publications
M. Z. Hasan et al., "Discovery of Topological Magnets: New Developments."https://absuploads.aps.org/presentation.cfm?pid=14503
M. Z. Hasan, S.-Y. Xu, I. Belopolski, S.-M. Huang, "Discovery of Weyl Fermion Semimetals and Topological Fermi Arc States," Ann. Rev. Cond. Mat. Phys. 8, 289-309 (2017).
M. Z. Hasan, "Weyl Semimetal," United States Patent #10214797, Nature Rev. Mater. 6, 784-803 (2021), Nature 612, 647-657 (2022).
S. Jia, S.-Y. Xu, M. Z. Hasan, "Weyl Semimetals, Fermi Arcs and Chiral Quantum Anomalies," Nature Mater. 15, 1140-1144 (2016), Science 349, 613-617 (2015).
M. Z. Hasan et al., "Topological Magnets: Discovery and Development."
D. Sanchez, T. Cochran, I. Belopolski et al., "Discovery of Topological Chiral Crystals and Helicoid Arc Quantum States," Nature Mater. 17, 978 (2018), Nature 567, 500-505 (2019), https://arxiv.org/abs/1812.04466
J. Yin, B. Lian, M. Z. Hasan, "Topological Kagome Magnets and Superconductors," Nature 612, 647-657 (2022).
T. Neupert, M. Denner, J.-X. Yin, R. Thomale, M. Z. Hasan, "Kagome Lattice: Charge Order and Superconductivity in Kagome Materials," Nature Phys. 18, 137-143 (2022).
S.-M. Huang, S.-Y. Xu, I. Belopolski et al., "New Type of Weyl Semimetal with Quadratic Double Weyl Fermions," Proc. Natl. Acad. Sci. 113, 1180 (2015).
I. Belopolski, D. Sanchez, G. Chang et al., "Discovery of Topological Weyl Fermion Lines and Drumhead Surface States in a Room Temperature Magnet," Science 365, 1278-1281 (2019).
S.-Y. Xu, N. Alidoust, G. Chang et al., "Discovery of Lorentz-violating Weyl Fermion Semimetal State in LaAlGe Materials," Sci. Adv. 3, e1603266 (2017).
D. Sanchez, T. Cochran, I. Belopolski et al., "Discovery of Topological Chiral Crystals with Helicoid Arc Quantum States," Nature 567, 500-505 (2019), https://arxiv.org/abs/1812.04466
G. Chang, B. Wieder et al., "Topological Quantum Properties of Weyl Chiral Crystals," Nature Mater. 17, 978-985 (2018).
J.-X. Yin, Y.-X. Jiang, X. Teng et al., "Discovery of Charge Order and Corresponding Edge State in a Kagome Magnet," Phys. Rev. Lett. 129, 166401 (2022).
H. Li, G. Fabbris, A. Said et al., "Discovery of Conjoined Charge Density Waves in the Kagome Superconductor CsV3Sb5," Nat. Commun. (2022).
G. Chang, B. Singh, S.-Y. Xu, G. Bian et al., "Theoretical Prediction of Magnetic Weyl Semimetal States in the R-Al-X Family of Compounds (R=rare earth, Al, X=Si, Ge)," https://arxiv.org/abs/1604.02124 (2016).
G. Chang, S.-Y. Xu, H. Zheng et al., "Room-temperature Magnetic Weyl Semimetal and Nodal Line Semimetal States in Co2TiX (X=Si, Ge, or Sn)," https://arxiv.org/abs/1603.01255 (2016).
X. Teng, L. Chen, F. Ye et al., "Discovery of Charge Density Wave in a Correlated Kagome Lattice Antiferromagnet," Nature 609, 490-495 (2022).
C. Mielke, D. Das, Jia-Xin Yin et al., "Time-reversal Symmetry-breaking Charge Order in a Kagome Superconductor," Nature 602, 245 (2022).
N. Shumiya, M. Shafayat Hossain, Jia-Xin Yin et al., "Evidence of a Room-temperature Quantum Spin Hall Edge State in a Higher-order Topological Insulator," Nature Mater. (2022).
I. Belopolski, D. Sanchez, G. Chang et al., "A Three-dimensional Magnetic Topological Phase (the First “Topological Magnet” in Three Dimensions Co2MnGa)," https://arxiv.org/abs/1712.09992 (2017).
S.-Y. Xu, C. Liu et al., "Observation of Fermi Arc Surface States in a Topological Metal," Science 347, 294-298 (2015).
S.-Y. Xu, N. Alidoust et al., "Discovery of a Weyl Semimetal State with Fermi Arcs in Niobium Arsenide," Nature Phys. 11, 748-754 (2015).
I. Belopolski, S.-Y. Xu, D. S. Sanchez et al., "Criteria for Directly Detecting (Proving) Topological Fermi Arcs in Weyl Semimetals," Phys. Rev. Lett. 116, 066802 (2016).
I. Belopolski, D. Sanchez, Y. Ishida et al., "Discovery of a New Type of Topological Weyl Fermion Semimetal State in MoxWTe2 Materials," Nat. Commun. 7, 13643 (2016).
S.-Y. Xu, I. Belopolski, N. Alidoust et al., "Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs," Science 349, 613-617 (2015).
S.-Y. Xu, Y. Xia, L.A. Wray et al., "Topological Phase Transition and Texture Inversion in a Tunable Insulator," Science 332, 560 (2011).
S.-M. Huang, S.-Y. Xu, I. Belopolski et al., "A Weyl Fermion Semimetal with Surface Fermi Arcs in the Transition Metal Mono-pnictide TaAs Class," Nat. Commun. 6:7373 (2015).
B. Singh, A. Sharma, H. Lin, M. Z. Hasan et al., "Topological Electronic Structure and Weyl Semimetal in the TlBiSe Class," Phys. Rev. B 86, 115208 (2012).
M. Z. Hasan et al., "Discovery of Topological Magnets in 2D and 3D," https://absuploads.aps.org/presentation.cfm?pid=14503
"Sir Nevill Mott (Nobel Laureate ’77) Lecture Series."
I. Belopolski, G. Chang, T. Cochran et al., "Observation of a Linked Loop Quantum State in a Topological Magnet," Nature 604, 647-652 (2022).
K. Jiang et al., "Kagome Superconductors AV3Sb5," https://arxiv.org/abs/2109.10809 (2021).
T. Neupert, M. Denner, J. Yin, R. Thomale, M. Z. Hasan, "Charge-order and Superconductivity in Kagome Lattice Materials," Nature Phys. (2021).
Y.-X. Jiang, J.-X. Yin, M. Denner et al., "Discovery of Unconventional Chiral Charge Order in Kagome Superconductor KV3Sb5," https://arxiv.org/abs/2012.15709 (2020).
C. Mielke III, D. Das, Jia-Xin Yin et al., "Time-reversal Symmetry-breaking Charge Order in a Kagome Superconductor," Nature 602, 245-250 (2022).
J.-X. Yin, W. Ma, T. A. Cochran et al., "Discovery of a Quantum Limit Chern Magnet TbMn6Sn6," Nature 583, 533-536 (2020).
D. Sanchez, T. Cochran, I. Belopolski, X. Xu et al., "Topological Chiral Crystals with Helicoid Arc Quantum States," Nature 567, 500-505 (2019).
I. Belopolski, G. Chang, T. Cochran et al., "Observation of a Linked Loop Quantum State in a Topological Magnet," Nature 604, 647-652 (2022).
M. Z. Hasan, G. Chang, G. Bian, S.Y. Xu, J.X. Yin, "Weyl, Dirac and High-fold Chiral Fermions in Topological Quantum Matter."
J. X. Yin, S. Pan, and M. Z. Hasan, "Probing topological matter with scanning tunnelling microscopy (STM)," Nat. Rev. Phys. 3, 249-263 (2021).
S. Jia, S.-Y. Xu, and M. Z. Hasan, "Weyl Semimetals, Fermi Arcs and Chiral Anomalies," Nat. Mater. 15, 1140–1144 (2016).
G. Chang, M. Z. Hasan et al., "Topological Quantum Properties of Chiral Crystals," Nat. Mater. 17, 978-985 (2018).
M. Z. Hasan, S.-Y. Xu, and G. Bian, "Topological Insulators, Topological Superconductors and Weyl Semimetals," Phys. Scr. T164, 014001 (2015).
M. Z. Hasan, S.-Y. Xu, and M. Neupane, "Topological Insulators, Topological Dirac Semimetals, Topological Crystalline Insulators, and Topological Kondo Insulators," in Topological Insulators: Fundamentals and Perspectives, edited by F. Ortmann, S. Roche, and S. Valenzuela (John Wiley & Sons, 2015).
M. Z. Hasan, D. Hsieh, S.-Y. Xu, L. Wray, and Y. Xia, "Topological Surface States - A New Type of 2D Electrons Systems," in Topological Insulators (Elsevier, 2013).
M. Z. Hasan and J. E. Moore, "Three-Dimensional Topological Insulators," Ann. Rev. Condens. Matter Phys. 2, 55 (2011).
M. Z. Hasan, "Topological Quantization in Topological Insulators," Physics 3, 62 (2010).
M. Z. Hasan and C. L. Kane, "Topological Insulators," Rev. Mod. Phys. 82, 3045 (2010).
M. Z. Hasan et al., "MERLIN - A meV Resolution Beamline at the Advanced Light Source (Berkeley Lab)," AIP Conf. Proc. 879, 509 (2007).
M. Z. Hasan et al., "Design of an elliptically bent refocus mirror for the MERLIN beamline at the Advanced Light Source (Berkeley Lab)," Nucl. Instrum. Methods Phys. Res. A 582, 135 (2007).
L. A. Wray, Y. Xia et al., "Superconductivity and Magnetism in Topological or Dirac Matter Observation of topological order in a superconducting doped topological insulator," Nat. Phys. 6, 855 (2010).
L. A. Wray, S.-Y. Xu, Y. Xia et al., "A topological insulator surface under strong Coulomb, magnetic and disorder perturbations," Nat. Phys. 7, 32 (2011).
S.-Y. Xu, M. Neupane et al., "Hedgehog spin texture and Berry's phase tuning in a magnetic topological insulator," Nat. Phys. 8, 616 (2012).
S.-Y. Xu, N. Alidoust, I. Belopolski et al., "Momentum-space imaging of Cooper pairing in a half-Dirac-gas topological superconductor," Nat. Phys. 10, 943 (2014).
T.-R. Chang, P.-J. Chen, G. Bian et al., "Topological Dirac surface states and superconducting pairing correlations in PbTaSe2," Phys. Rev. B 93, 245130 (2016).
S.-Y. Xu, N. Alidoust, I. Belopolski et al., "Discovery of Lorentz-violating Weyl fermions," Sci. Adv. 3, e1603266 (2017).
J.-X. Yin, S. S. Zhang et al., "Giant and anisotropic many-body spin–orbit tunability in a correlated kagome magnet," Nature 562, 91–95 (2018).
C.-K. Chiu, G. Bian et al., "Chiral Majorana Fermion Modes on the surface of superconducting topological Insulators," Europhys. Lett. 123, 47005 (2018).
I. Belopolski, K. Manna et al., "Discovery of Weyl lines and drumhead surface states in a room temperature magnet," Science 365, 1278-1281 (2019).
S. S. Zhang, J.-X. Yin et al., "Field-free platform for Majorana-like zero mode in superconductors with a topological surface state," Phys. Rev. B 101, 100507(R) (2020).
M. Z. Hasan, S.-Y. Xu, I. Belopolski, S.-M. Huang, "Discovery of Weyl Fermion Semimetals and Topological Fermi Arc States," Ann. Rev. Condens. Matter Phys. 8, 289-309 (2017).
S.-M. Huang et al., "Weyl Semimetal patent: United States Patent # 10214797. Theoretical Prediction of TaAs family," Nat. Commun. 6, 7373 (2014).
M. Z. Hasan and C. L. Kane, "Topological Insulators (and Superconductors)," Rev. Mod. Phys. 82, 3045 (2010).
Y. Xia et al., "Theoretical Prediction of Bi2Se3 family of Topological Insulators," arXiv:0908.3513 (2009).
Inventions, Breakthroughs & Patents :
# Developed methods for determining Z2 topological invariants and Mirror Chern numbers from spin-ARPES experiments alone without referring to theory (Nature 2009, Science 2009, Science 2011). These detailed methods were used to demonstrate that the 3D Topological Insulators are a new and distinct state of matter, which cannot be reduced to multiple copies of IQH, and there is no spin Hall effect in 3D. The 3D state is thus an example of non-quantum-Hall-like topological matter and the first realization of topologically ordered bulk solid in nature (Physics World 2011, Physics Today 2010).
# Demonstrated that electrons on the surface of some spin-orbit materials form a topologically-ordered two dimensional gas with a non-trivial Berry's phase (arXiv:0812.2078 (2008), Nature 2009)
# Developed methods for the demonstration of spin-momentum locking without utilizing any transport method (Nature 2009, Science 2009, Science 2011)
# Developed methods for the determination of Chern invariant and Chern gap from spin-ARPES experiments (Nature Physics 2012)
# Developed methods and algorithms for the identification of chiral fermions (Weyl and other chiral fermions) from spectroscopic experiments without replying on band-structure measurements (Science 2015a, Nature Physics 2015, Science 2015b)
# Developed methods and algorithms for the identification of Fermi arc fermions "Criteria for Directly Detecting (Proving) Topological Fermi Arcs" (Phys. Rev. Lett. 116, 066802 (2016))
# Demonstrated methods and algorithms for “Momentum-space imaging of Cooper pairing in a half-Dirac-gas Superconductor (based on a topological insulator)” (Nature Physics 10, 943 (2014))
# Demonstrated Adiabatic continuation approach to theoretically predict topo. materials Working with Hsin Lin demonstrated that first-principles-based adiabatic continuation approach is a powerful and efficient tool for constructing topological phase diagrams and locating non-trivial topological insulator materials. Applied to real materials, results demonstrated the efficacy of adiabatic continuation for exploring topologically nontrivial alloying systems and for identifying new topological insulators even when the underlying lattice does not possess inversion symmetry, and the approaches based on parity analysis of Fu-Kane methods are not viable. (Nature Materials 9, 546 (2010); Phys. Rev. B 87, 121202(R) (2013).)
# Discovery (Theoretical Prediction & Experimental Demonstration) of Weyl semimetals -- Weyl fermion and topological Fermi arcs in spin-orbit materials (Science 349, 613 (2015); Science 347, 294 (2015). Nature Phys 11, 748 (2015))
# Developed and demonstrated a novel artificial condensed matter lattice and a new platform for one-dim. topological phases (Science Advances 3, e1501692 (2017))
# Demonstrated quantum transport in bulk insulating topological insulators and Quantum transport response of topological hinge modes in a topological insulator (Nature Physics 20, 776–782 (2024) and Nature Physics 10, 956-963 (2014))
# First Observation of Chern gap in 2012 Hedgehog spin texture and Berry's phase tuning in a magnetic topological insulator (Nature Physics 8, 616 (2012))
# First example of Weyl semimetals and the methods for its discovery US Patent#10214797 “Method for production and identification of Weyl semimetal” (2016)
# Discovered and demonstrated Topological nodal-line (continuous Dirac/Weyl) semimetals (2015-2016) Led in the theoretical prediction and experimental discovery of topological nodal-line semimetals (Nature Commun (2016), arXiv 2015) and elucidated their nontrivial topological electronic structure including Dirac loop Fermi surfaces known as nodal rings (demonstrated in PbTaSe2 and TlTaSe2) (Nature Commun. 7:10556 (2016); Physical Review B (2016))
# Demonstrated Giant and anisotropic many-body spin–orbit tunability in a correlated topo. kagome magnet (NATURE 562, 91–95 (2018))
# Demonstrated Quantum-limit Chern topological magnet (NATURE 583, 533 (2020))
# Demonstrated Magnetic-field control of topological electronic response near room temperature in correlated Kagome magnets (Physical Review Letters 123, 196604 (2019))
# Demonstrated Many-body Resonance in a Correlated Topological Kagome Antiferromagnet (Phys. Rev. Lett. 125, 046401 (2020))
# Discovered and demonstrated Room-temperature quantum spin Hall edge state in a topological insulator (Nature Materials 21, 1111 (2022))
# First example of room-temperature topological quantum edge state
“Identification Procedure of Room-Temp. Quantum Spin Hall Topological Edge State”
PATENT FILING Ref#: 24-4088-1 (2024)
# Fabrication of Quantum Devices using Intrinsic Insulating Topological Materials
“Quantum device using insulating topo. material” PATENT FILING Ref#: 24-4093-1 (2024)
These research works have been featured in Physics Today, Physics World, Scientific American, Nature News, Science News, Discover magazine, New Scientist and similar media, including Physics Today’s “Search & Discovery News” multiple times over the last two decades.
Top-Ten Physics Discoveries of the last ten years by Nature Physics (2011)
Top-Ten Breakthrough of 2015 by Physics World
Several results included in modern textbooks of condensed matter physics (since 2018)
Topological Quantum Matter
Topological Insulators: Discovery & Fundamental Properties
Experiments started in 2004, completed in 2007, paper submitted in 2007
https://newscenter.lbl.gov/2017/04/14/how-x-rays-pushed-topological-matter-research-over-the-top/
2007 KITP invited talk: https://www.on.kitp.ucsb.edu/online/motterials07/hasan/
A topological Dirac insulator in a quantum spin Hall phase. [submitted in 2007]
D. Hsieh, D. Qian, L. Wray, et al.; (PI: M. Z. Hasan)
NATURE 452, 970 (2008). [submitted in 2007]
Electrons on the surface of Bi2Se3 form a topologically-ordered two dimensional gas with a non-trivial Berry's phase (Discovery of topological-insulator class with a single Dirac cone in 2008)
Preprint at arXiv:0812.2078 (2008)
Observation of Unconventional Quantum Spin Textures in Topological Insulators.
D. Hsieh, Y. Xia, L. Wray, et al.; (PI: M. Z. Hasan)
SCIENCE 323, 5916 (2009).
A tunable topological insulator in the spin helical Dirac transport regime.
D. Hsieh, Y. Xia, D. Qian, et al.; (PI: M. Z. Hasan)
NATURE 460, 1101 (2009).
Observation of a large-gap topological-insulator class with a single Dirac cone on the surface
Y Xia, D Qian, D Hsieh, L Wray, A Pal, H Lin et., al.
Nature Physics 5, 398-402 (2009)
Observation of Time-Reversal-Protected Single-Dirac-Cone Topological-Insulator States in Bi2X3 family
D Hsieh, Y Xia, D Qian, L Wray et., al.
Physical Review Letters 103, 146401 (2009)
Topological surface states protected from backscattering by chiral spin texture
P Roushan, J Seo, CV Parker, YS Hor, D Hsieh, D Qian et., al.
NATURE 460, 1106-1109 (2009)
Half-Heusler ternary compounds as new multifunctional experimental platforms for topological quantum phenomena
H Lin, LA Wray, Y Xia, S Xu, S Jia, RJ Cava, A Bansil, MZ Hasan
Nature Materials 9, 546-549 (2010)
Single-Dirac-Cone Topological Surface States in the TlBiSe2 Class of Topological Semiconductors
H Lin, RS Markiewicz, LA Wray, L Fu, MZ Hasan, A Bansil
Physical Review Letters 105, 036404 (2010)
A topological insulator surface under strong Coulomb, magnetic and disorder perturbations
LA Wray, SY Xu, Y Xia, D Hsieh, AV Fedorov, YS Hor, RJ Cava, A Bansil, M. Z. Hasan
Nature Physics 7, 32-37 (2011)
Topological phase transition and texture inversion in a tunable topological insulator.
S.-Y. Xu, Y. Xia, L.A. Wray, et al.; (PI: M. Z. Hasan)
SCIENCE 332, 560 (2011).
Hedgehog spin texture and Berry's phase tuning in a magnetic topological insulator.
S.-Y. Xu, M. Neupane, C. Liu, et al.; (PI: M. Z. Hasan)
Nature Physics 8, 616 (2012).
“Momentum-space imaging of Cooper pairing in a half-Dirac-gas topological
Superconductor (based on a topological insulator)”
Su-Yang Xu, N. Alidoust, I. Belopolski et.al., (PI: M. Z. Hasan)
Nature Physics 10, 943 (2014)
Observation of topological surface state quantum Hall effect in an intrinsic three-dimensional topological insulator (quantum transport in bulk insulating topological insulators)
Y Xu, I Miotkowski, C Liu, J Tian, H Nam, N Alidoust, J Hu, CK Shih, M. Z. Hasan, Y. Chen
Nature Physics 10, 956-963 (2014)
Room-temperature quantum spin Hall edge state in a higher-order topological insulator Bi4Br4
Nana Shumiya, Md Shafayat Hossain, Jia-Xin Yin et.al., (PI: M. Z. Hasan)
Nature Materials 21, 1111–1115 (2022)
A hybrid topological quantum state in an elemental solid
Md Shafayat Hossain, Frank Schindler et.al., (PI: M. Z. Hasan)
NATURE 628, 527–533 (2024).
Boundary modes of a charge density wave state in a topological material
Maksim Litskevich, Md Shafayat Hossain, S-B. Zhang, Zi-Jia Cheng et.al., (PI: M. Z. Hasan)
Nature Physics 20, 1253–1261 (2024).
Quantum transport response of topological hinge modes in a topological insulator
Md Shafayat Hossain, Qi Zhang, Zhiwei Wang, (PI: M. Z. Hasan)
Nature Physics 20, 776–782 (2024)
Topological Magnets: Discovery & Fundamental Properties
Experiments started in 2008, completed in 2008, paper submitted in 2008
Original preprint at arXiv:0812.2078 (2008) (First Observation of Chern gap in 2012)
APS invited talk on the Discovery: https://absuploads.aps.org/presentation.cfm?pid=14503
A topological insulator surface under strong Coulomb, magnetic and disorder perturbations
LA Wray, SY Xu, Y Xia, D Hsieh, AV Fedorov et.al., (PI: M. Z. Hasan)
Nature Physics 7, 32-37 (2011)
(First Observation of Chern gap in 2012)
Hedgehog spin texture and Berry's phase tuning in a magnetic topological insulator.
S.-Y. Xu, M. Neupane, C. Liu, et al.; (PI: M. Z. Hasan)
Nature Physics 8, 616 (2012).
Giant and anisotropic many-body spin–orbit tunability in a correlated topo. kagome magnet
Jia-Xin Yin, Songtian S. Zhang, Hang Li et.al.; (PI: M. Z. Hasan)
NATURE 562, 91–95 (2018).
(Topological Magnetic Semimetals) Discovery of Weyl fermion lines and drumhead surface states in a room temp. topological magnet
Ilya Belopolski, K. Manna, Daniel Sanchez et.al., (PI: M. Z. Hasan)
SCIENCE 365, 1278 (2019).
Topological Chiral Crystals with Helicoid Arc Quantum States
Daniel Sanchez, Ilya Belopolski, Tyler Cochran et.al., (PI: M. Z. Hasan)
NATURE 567, 500-504 (2019).
Quantum-limit Chern topological magnet
J-X. Yin, S.S. Zhang et.al., (PI: M. Z. Hasan)
NATURE 583, 533–536 (2020).
Rare Earth Engineering in RMn6Sn6 (R=Gd−Tm, Lu) Topological Kagome Magnets.
Wenlong Ma, Xitong Xu, Jia-Xin Yin et.al.,
Phys. Rev. Lett. 126, 246602 (2021).
“Observation of a linked loop quantum state in a topological magnet”
I. Belopolski, G. Chang, T. Cochran etal., (PI: M. Z. Hasan)
NATURE 604, 647-652 (2022)
A topological Hund nodal line antiferromagnet
Xian P. Yang, Yueh-Ting Yao, Pengyu Zheng et.al., (PI: M. Z. Hasan)
Nature Commun. 15, 7052 (2024)
Topological Weyl/Dirac semimetals: Discovery & Fundamental Properties
Experiments started in 2011, completed in 2014
APS invited talk on the Discovery: https://absuploads.aps.org/presentation.cfm?pid=14503
Topological phase transition and texture inversion (at 3D bulk Dirac point) in a tunable topological insulator.
S.-Y. Xu, Y. Xia, L.A. Wray, et al.; (PI: M. Z. Hasan)
SCIENCE 332, 560 (2011).
Observation of Fermi Arc Surface States in a Topological Metal.
S.-Y. Xu, C. Liu, S K. Kushwaha et.al., (PI: M. Z. Hasan)
SCIENCE 347, 294 (2015). (paper submitted in 2014)
Discovery of a Weyl Fermion semimetal and topological Fermi arcs.
S.-Y. Xu, I. Belopolski, N. Alidoust et.al., (PI: M. Z. Hasan)
SCIENCE 349, 613 (2015).
Discovery of topo. Weyl fermion lines and drumhead surface states in a room temp. magnet
Ilya Belopolski, K. Manna, Daniel Sanchez et.al., (PI: M. Z. Hasan)
SCIENCE 365, 1278 (2019).
Giant and anisotropic many-body spin–orbit tunability in a correlated kagome magnet
Jia-Xin Yin, Songtian S. Zhang, Hang Li et.al.; (PI: M. Z. Hasan)
NATURE 562, 91–95 (2018).
Topological Chiral Crystals with Helicoid Arc Quantum States (Topological Semimetals)
Daniel Sanchez, Ilya Belopolski, Tyler Cochran et.al., (PI: M. Z. Hasan)
NATURE 567, 500-504 (2019).
Coexistence of Bulk-Nodal and Surface-Nodeless Cooper Pairings in a Superconducting Dirac Semimetal.
Yang, X.P., Zhong, Y., Mardanya, S., Cochran, T.A., Chapai, R., Mine, A., Zhang, J., Sánchez-Barriga, J., Cheng, Z-J., Clark, O.J., Yin, J-X., Blawat, J., Cheng, G., Belopolski, I., Nagashima, T., Najafzadeh, S., Gao, S., Yao, N., Bansil, A., Jin, R., Chang, T-R., Shin, S., Okazaki, K. & Hasan, M.Z.
Phys. Rev. Lett. 130, 046402 (2023).
Tunable topologically driven Fermi arc van Hove singularities.
Sanchez, D.S., Cochran, T.A., Belopolski, I., Cheng, Z-J., Yang, X.P., Liu, Y., Hou, T., Xu, X., Manna, K., Shekhar, C., Yin, J-X., Borrmann, H., Chikina, A., Denlinger, J.D., Stro cov, V.N., Xie, W., Felser, C., Jia, S., Chang, G. & Hasan, M.Z.
Nature Physics 19, 682 (2023).
Causal structure of interacting Weyl fermions in condensed matter systems.
Chiu, W-C., Chang, G., Macam, G., Belopolski, I., Huang, S-M., Markiewicz, R., Yin, J-X., Cheng, Z-J., Lee, C-C., Chang, T-R., Chuang, F-C., Xu, S-Y., Lin, H., Hasan, M.Z.& Bansil, A.
Nature Commun. 14, 2228 (2023).
Visualizing Higher-Fold Topology in Chiral Crystals.
Cochran, T.A., Belopolski, I., Manna, et.al., (PI: M. Z. Hasan)
Phys. Rev. Lett. 130, 066402 (2023)
A hybrid topological quantum state in an elemental solid
Md Shafayat Hossain, Frank Schindler et.al., (PI: M. Z. Hasan)
NATURE 628, 527–533 (2024).
Topological Kagome Magnets & Superconductors
Opened several new unexpected research fronts in topological kagome research ..
Giant and anisotropic many-body spin–orbit tunability in a correlated kagome magnet
Jia-Xin Yin, Songtian S. Zhang, Hang Li et.al.; (PI: M. Z. Hasan)
NATURE 562, 91–95 (2018).
Quantum-limit Chern topological magnet (kagome magnet)
J-X. Yin, S.S. Zhang et.al., (PI: M. Z. Hasan)
NATURE 583, 533–536 (2020).
Unconventional chiral charge order in kagome superconductor KV3Sb5.
Yu-Xiao Jiang, Jia-Xin Yin, M. Michael Denner, Nana Shumiya, Brenden R. Ortiz, Gang Xu, Zurab Guguchia, Junyi He, Md Shafayat Hossain, Xiaoxiong Liu, Jacob Ruff, Linus Kautzsch, Songtian S. Zhang, Guoqing Chang, Ilya Belopolski, Qi Zhang, Tyler A. Cochran, Daniel Multer, Maksim Litskevich, Zi-Jia Cheng, Xian P. Yang, Ziqiang Wang, Ronny Thomale, Titus Neupert, Stephen D. Wilson, M. Zahid Hasan.
Nature Materials 20, 1353–1357 (2021).
Rare Earth Engineering in RMn6Sn6 (R=Gd−Tm, Lu) Topological Kagome Magnets.
Wenlong Ma, Xitong Xu, Jia-Xin Yin et.al.,
Phys. Rev. Lett. 126, 246602 (2021).
Time-reversal symmetry-breaking charge order in a kagome superconductor
C. Mielke, D. Das, Jia-Xin Yin et.al., (Co-PI: M. Z. Hasan)
NATURE 602, 245 (2022)
Topological Kagome Magnets and Superconductors
J. Yin, B. Lian, M. Z. Hasan
NATURE 612, 647-657 (2022)
“Discovery of charge order and corresponding edge state in kagome magnet FeGe”
Jia-Xin Yin, Yu-Xiao Jiang, Xiaokun Teng, Md. Shafayat Hossain et.al., (PI: M. Z. Hasan)
Phys. Rev. Lett. 129, 166401 (2022)
“Charge order and superconductivity in kagome materials”
T. Neupert, M. Denner, J.-X. Yin, R. Thomale & M. Z. Hasan
Nature Physics 18, 137 (2022)
Discovery of conjoined charge density waves in the kagome superconductor CsV3Sb5
H Li, G Fabbris, AH Said, JP Sun, YX Jiang, JX Yin, et.al.,
Nature Commun. 13, 6348 (2022)
Discovery of charge density wave in a correlated kagome lattice antiferromagnet
X. Teng, L. Chen, F. Ye et.al.,
NATURE 609, 490-495 (2022)
Tunable unconventional kagome superconductivity in charge ordered RbV3Sb5 and KV3Sb5.
Guguchia, Z., Mielke III, C., Das, D., Gupta, R., Yin, J-X., et.al.,
Nature Commun. 14, 153 (2023).
Hidden magnetism uncovered in charge ordered bilayer kagome material
Z. Guguchia, D. J. Gawryluk, Soohyeon Shin, Z. Hao, et.al.,
Nature Commun. 14, 7796 (2023)
Tunable topologically driven Fermi arc van Hove singularities.
Sanchez, D.S., Cochran, T.A., Belopolski, I., et.al., (PI: M. Z. Hasan)
Nature Physics 19, 682 (2023).
Visualizing Higher-Fold Topology in Chiral Crystals.
Cochran, T.A., Belopolski, I., Manna, K., Yahyavi, M., Liu, Y., Sanchez, D.S., Yang, X.P., Multer, D., Yin, J-X., Borrmann, H., Chikina, A., Krieger, J.A., Sánchez-Barriga, J., Le Fèvre, P., Bertran, F., Strocov, V.N., Denlinger, J.D., Chang, T-R., Jia, S., Felser, C., Lin, H., Chang, G. & Hasan, M.Z.
Phys. Rev. Lett. 130, 066402 (2023)
Tunable topologically driven Fermi arc van Hove singularities.
Sanchez, D.S., Cochran, T.A., Belopolski, I., Cheng, Z-J., Yang, X.P., Liu, Y., Hou, T., Xu, X., Manna, K., Shekhar, C., Yin, J-X., Borrmann, H., Chikina, A., Denlinger, J.D., Stro cov, V.N., Xie, W., Felser, C., Jia, S., Chang, G. & Hasan, M.Z.
Nature Physics 19, 682 (2023).
Charge density wave in topological kagome metal ScV6Sn6
Yong Hu, Junzhang Ma, Yinxiang Li et.al.,
Nature Commun 15, 1658 (2024)
Depth-dependent study of time-reversal symmetry-breaking in the kagome superconductor AV3Sb5
J. N. Graham, C. Mielke III, D. Das et.al.,
Nature Commun 15, 8978 (2024).
A topological Hund nodal line antiferromagnet
Xian P. Yang, Yueh-Ting Yao, Pengyu Zheng et.al., (PI: M. Z. Hasan)
Nature Commun. 15, 7052 (2024)
Van Hove annihilation and nematic instability on a kagome lattice
Yu-Xiao Jiang, Sen Shao, Wei Xia, M. Michael Denner et.al., (PI: M. Z. Hasan)
Nature Materials (2024). https://doi.org/10.1038/s41563-024-01914-z
Key Publications :
Selected Publications (30 representative high-impact, most-cited papers in 5 sub-fields)
Topological Insulators (Discovery, Fundamental Properties & Transport)
Hsieh, D. et al. A topological Dirac insulator in a quantum spin Hall phase.
Nature 452, 970–974 (2008). [submitted in 2007, 2007-KITP Proceeding (online): https://www.on.kitp.ucsb.edu/online/motterials07/hasan/]
Hsieh, D. et al. Observation of unconventional quantum spin textures in topological insulators.
Science 323, 919–922 (2009). [submitted in 2008]
Hsieh, D. et al. A tunable topological insulator in the spin helical Dirac transport regime.
Nature 460, 1101–1105 (2009).
Xia, Y. et al. Observation of a large-gap topological-insulator class with a single Dirac cone on the surface.
Nature Physics 5, 398–402 (2009). [submitted in 2008]
Xu, Y. et al. Observation of topological surface state quantum Hall effect in an intrinsic three-dimensional topological insulator (quantum transport in bulk insulating topological insulators)
Nature Physics 10, 956-963 (2014).
Shumiya, N. et al. Room-temperature topological quantum spin edge state in a higher-order topological insulator Bi₄Br₄.
Nature Materials 21, 1111 (2022).
Litskevich, M. et al. Boundary modes of a charge density wave state in a topological insulator.
Nature Physics 20, 1253–1261 (2024).
Hossain, M. et al. A hybrid topological quantum state in an elemental solid.
Nature628, 527–533 (2024).
Hossain, M. et al. Quantum transport response of topological modes in a topological insulator.
Nature Physics 20, 776–782 (2024)
Hossain, M.S. et al. Topological excitonic insulator with tunable momentum order
Nature Physics 21, 1250 (2025)
Weyl Semimetals & Topo Semimetals (Discovery, Key Property & Transport)
Xu, S.-Y. et al. Observation of Fermi arc surface states in a topological metal.
Science 347, 294–298 (2015).
12. Xu, S.-Y. et al. Discovery of a Weyl fermion semimetal and topological Fermi arcs.
Science 349, 613–617 (2015).
13. Xu, S.-Y. et al. Discovery of a Weyl fermion state with Fermi arcs in niobium arsenide.
Nature Phys 11, 748–754 (2015).
14. Zhang, C.-L. et al. Signatures of Adler–Bell–Jackiw anomaly in a Weyl semimetal.
Nature Commun. 7, 10735 (2016).
15. Belopolski, I. et al., Fermi arc electronic structure and Chern numbers in the type-II Weyl Semimetal (measured using ARPES)
Phys. Rev. B 94, 085127 (2016).
16. Belopolski, I. et al. Discovery of Weyl fermion lines and drumhead surface states in a room temperature topological magnet (including transport).
Science 365, 1278–1281 (2019).
17. Sanchez, D. et al. Topological chiral crystals with helicoid arc quantum states.
Nature 567, 500–504 (2019).
18. Sanchez, D. et al. Tunable topologically driven Fermi arc van Hove singularities.
Nature Physics 19, 682 (2023).
Topological Magnets & Topo Phase Transitions (Discovery, Key Property)
19. Xu, S.-Y. et al. Hedgehog spin texture and Berry’s phase tuning in a magnetic topological insulator (Topological Chern magnet).
Nature Physics 8, 616–622 (2012).
20. Xu, S.-Y. et al. Topological phase transition and texture inversion in a tunable topological insulator.
Science 332, 560–564 (2011).
21. Wray, L.A. et al. A topological insulator surface under strong Coulomb, magnetic and disorder perturbations
Nature Physics 7, 32-37 (2011)
22. Yin, J.-X. et al. A Quantum-limit Chern topological magnet
Nature 583, 533 (2020).
23. Belopolski, I. et al. Observation of a linked loop quantum state in a topological magnet
Nature 604, 647-652 (2022)
Topo Kagome Magnets & Superconductors (Funda. Properties & Transport)
Unpredicted, unexpected Quantum many-body emergent physics
24. Yin, J.-X. et al. Giant and anisotropic many-body spin–orbit tune-ability in a correlated kagome magnet.
Nature 562, 91–95 (2018).
25. Teng, X. et al. Discovery of charge density wave in a correlated kagome lattice antiferromagnet.
Nature 609, 490-495 (2022)
26. Jiang, Y.-X. et al. Unconventional chiral charge order in a kagome superconductor.
Nature Materials 20, 1353–1357 (2021).
27. Hossain, M. S. et al. A hybrid topological quantum state in an elemental solid.
Nature 628, 527–533 (2024).
28. Yin, J. et al. Topological Kagome Magnets and Superconductors.
Nature 612, 647-657 (2022).
29. Cheng, Z.-J. et al. Broken symmetries associated with a Kagome chiral charge order
Nature Commun. 16, 3782 (2025)
30. Hossain, M. et al. Unconventional gapping behavior in a kagome superconductor
Nature Physics 21, 556 (2025).
Key Reviews
Hasan, M. Z. et al. Discovery of Weyl Fermion Semimetals and Topological Fermi Arc States Ann. Rev. of Cond. Matt. Phys 8, 289-309 (2017) (Invited)
Yin, J., Pan, S., Hasan, M. Z. Probing topological quantum matter with scanning tunnelling (spectro-) microscopy (STM/STS). Nature Rev. Physics 3, 249-263 (2021) (Invited)
Neupert, T. et al. (Hasan, M. Z.) Charge Order and Superconductivity in Kagome materials. Nature Physics 18, 137 (2022)
Hasan, M. Z. et al. Weyl, Dirac and high-fold chiral fermions in topological quantum matter Nature Reviews Materials 6 (9), 784-803 (Invited)
Hasan, M. Z. & Kane, C. L. Colloquium: Topological Insulators. Rev. Mod. Phys. 82, 3045–3067 (2010) (submitted in 2009, invited review) [ >25,000 citations; most-cited article in the entire field of topological physics]. (Invited)
Theoretical Predictions of Topological Materials by Hasan group (2008-)
Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class (Bi2Se3 class) with spin-polarized single-Dirac-cone on the surface https://arxiv.org/abs/0908.3513 (2009)
(Theoretical Prediction of Weyl semimetals in 2012)
“Topological Electronic Structure and WEYL Semimetal in the TlBiSe Class,” Physical Review B 86, 115208 (2012).
“New Type of Weyl Semimetal with Quadratic Double Weyl Fermions,” Proc. Natl. Acad. Sci. 113, 1180 (2015).
“A Weyl Fermion Semimetal with Surface Fermi Arcs in the Transition Metal Mono-pnictide TaAs Class,” Nature Commun. 6:7373 (2015).
"Room-temperature Magnetic Weyl Semimetal and Nodal Line Semimetal States in Co2TiX (X=Si, Ge, or Sn),"
https://www.arxiv.org/pdf/1604.02124v1 (2016)
"Theoretical Prediction of Magnetic Weyl Semimetal States in the R-Al-X Family of Compounds" Physical Review B 97, 041104 (2018)
(Theoretical Prediction of ) Topological Hopf and Chain Link Semimetal States and Their Applications Physical Review Letters 119, 156401 (2017)
(Theoretical Prediction of ) "Topological Quantum Properties of Weyl Chiral Crystals,"
Nature Materials 17, 978-985 (2018).
Unexpected and unpredicted novel (many-body, correlated) quantum phenomena in Topological Kagome Magnets & Superconductors:
Unexpected and unpredicted novel (many-body, correlated) quantum phenomena in Topological Kagome Magnets & Superconductors:
Experiments started in 2017, completed in 2017, Nature’18, NaturePhys’19, PRL’19, PRL’20, NatureCom’20a, NatureCom’20b, NatureCom’20c, Nature’20, NatureMat’21, PRL’21, Science’19, Nature’19, Nature’22a, Nature’22b, PRL’22, NaturePhys’22, NatureCom’22, NatureCom’23a, NatureCom’23b, NaturePhys’23, NatureCom’24a, NatureCom’24b, NatureCom’24c, NatureMat’24
Novel quantum phenomena in Topological kagome magnets and superconductors : https://www.nature.com/articles/s41586-022-05516-0
