Twisted bilayer graphene: topological pumping and switching of topology by current [Slides]

Technical Report · Mon Jul 06 00:00:00 EDT 2020

DOI:https://doi.org/10.2172/1637689· OSTI ID:1637689

Su, Ying  ^[1]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The presentation was prepared for a BLABS seminar and includes various graphical images. The summary given highlighted: Topological pumping can be triggered by interlayer sliding in TBG due to the nontrivial topology associated with the synthetic dimension; Time-reversal symmetry of TBG can be spontaneously broken by Coulomb interaction, that results in the valley-polarized QAH state at 3/4 filling; A large enough current can pump electrons from the valence band to conductance band, that redistributes the electron occupation; and, the redistribution of electron occupation combined with the Coulomb interaction can switch the valley polarization and topology.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program
• DOE Contract Number: 89233218CNA000001
• OSTI ID: 1637689
• Report Number(s): LA-UR-20-24896
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE