Sponsoring Units: DCMPChair: Joseph Roll, University of Texas at Austin
Fri. March 8, 8:00 a.m. – 8:12 a.m. CST
L100J
Remarkable recent experiments have observed fractional quantum anomalous Hall (FQAH) effects at zero field and unusually high temperatures in twisted semiconductor bilayer tMoTe₂. Intriguing observations in these experiments such as the absence of integer Hall effects at twist angles where a fractional Hall effect is observed, do however remain unexplained. The experimental phase diagram as a function of twist angle remains to be established. By comprehensive numerical study, we show that band mixing has large qualitative and quantitative effects on the energetics of competing states and their energy gaps throughout the twist angle range θ≤4∘. This lays the ground for the detailed realistic study of a rich variety of strongly correlated twisted semiconductor multilayers and an understanding of the phase diagram of these fascinating systems.
Presented By
Ahmed Abouelkomsan (Massachusetts Institute of Technology)
Authors
Ahmed Abouelkomsan (Massachusetts Institute of Technology)
Aidan Reddy (Massachusetts Institute of Technology MI)
Liang Fu (Massachusetts Institute of Technology MI)
Emil J Bergholtz (Stockholm University)
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Band mixing in the quantum anomalous Hall regime of twisted semiconductor bilayers
Fri. March 8, 8:00 a.m. – 8:12 a.m. CST
L100J
Remarkable recent experiments have observed fractional quantum anomalous Hall (FQAH) effects at zero field and unusually high temperatures in twisted semiconductor bilayer tMoTe₂. Intriguing observations in these experiments such as the absence of integer Hall effects at twist angles where a fractional Hall effect is observed, do however remain unexplained. The experimental phase diagram as a function of twist angle remains to be established. By comprehensive numerical study, we show that band mixing has large qualitative and quantitative effects on the energetics of competing states and their energy gaps throughout the twist angle range θ≤4∘. This lays the ground for the detailed realistic study of a rich variety of strongly correlated twisted semiconductor multilayers and an understanding of the phase diagram of these fascinating systems.
Presented By
Ahmed Abouelkomsan (Massachusetts Institute of Technology)
Authors
Ahmed Abouelkomsan (Massachusetts Institute of Technology)
Aidan Reddy (Massachusetts Institute of Technology MI)
Liang Fu (Massachusetts Institute of Technology MI)