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VERSION:2.0
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CALSCALE:GREGORIAN
X-WR-CALNAME:Physics Colloquium: Di Xiao\, University of Washington
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260909T100910Z
UID:tag:localist.com\,2008:EventInstance_48586157716315
DTSTART:20250326T200000Z
DTEND:20250326T210000Z
DESCRIPTION:TOPOLOGICAL STATES IN TWISTED BILAYER TRANSITION METAL DICHALCO
 GENIDES\n \n\nRecently\, both the integer and fractional quantum Hall effe
 ct has been observed in twisted bilayer transition metal dichalcogenides (
 TMDs) at zero magnetic field\, generating widespread interest in this mate
 rials system.  In this talk\, I will first briefly review the route toward
 s materials realization of topological states\, and then focus on the basi
 c models describing twisted bilayer TMDs\, including the origin of the non
 trivial topology. I will then discuss how machine learning method can be u
 sed to establish the microscopic Hamiltonian and the important role of pol
 arization charges in determining the band topology.  Phase diagrams at var
 ious fillings as a function of twist angle and gate voltage will be discus
 sed as well.\n\nReference\n1.    Signatures of fractional quantum anomalou
 s Hall states in twisted MoTe2\, Cai et al\, Nature 622\, 63 (2023)\n2.   
  Observation of fractionally quantized anomalous Hall effect\, Park et al\
 , Nature 622\, 74 (2023)\n3.    Fractional Chern insulator in twisted bila
 yer MoTe2\, Wang et al\, Phys. Rev. Lett. 132\, 036501 (2024)\n4.    Gate-
 tunable antiferromagnetic Chern insulator in twisted bilayer transition me
 tal dichalcogenides\, Liu et al\, Phys. Rev. Lett. 132\, 146401(2024)\n5. 
    Polarization-driven band topology evolution in twisted MoTe and WSe2\, 
 Zhang et al\, Nature Communications 15\, 4223 (2024)\n6.    Higher Landau-
 Level Analogues and Signatures of Non-Abelian States in Twisted Bilayer Mo
 Te2\, Wang et al\, Phys. Rev. Lett. 134\, 076503 (2025)\n7.    Microscopic
  signatures of topology in twisted MoTe2\, Thompson et al\, Nature Physics
  (accepted)
GEO:42.335064;-71.168846
LOCATION:Higgins Hall\, 310
SUMMARY:Physics Colloquium: Di Xiao\, University of Washington
URL;VALUE=URI:https://events.bc.edu/event/physics-colloquium-di-xiao-univer
 sity-of-washington
CATEGORIES:Lecture
END:VEVENT
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