Spin-textured Chern bands in AB-stacked transition metal dichalcogenide bilayers

Zhang, Yang; Devakul, Trithep; Fu, Liang

doi:10.1073/pnas.2112673118

Spin-textured Chern bands in AB-stacked transition metal dichalcogenide bilayers

Journal Article · Thu Sep 02 00:00:00 EDT 2021 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.2112673118· OSTI ID:1819966

^[1]; ^[1]; Fu, Liang ^[1]

Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139

Significance

The long-wavelength moiré superlattices in twisted two-dimensional (2D) structures have emerged as a highly tunable platform for strongly correlated electron physics. In this work, we reveal the displacement field–induced topological moiré bands in AB-stacked transition-metal dichalcogenide (TMD) heterobilayer ${M o T e}_{2}$ / ${W S e}_{2}$ . Valley-contrasting Chern bands with nontrivial spin texture are formed from interlayer hybridization between ${M o T e}_{2}$ and ${W S e}_{2}$ bands of nominally opposite spins. The general mechanism for band inversion we uncovered in AB-stacked TMD bilayers is quite robust and can be applied to other material combinations as well. Our study establishes a recipe for creating topological bands in AB-stacked TMD bilayers in general, which provides a highly tunable platform for realizing quantum-spin Hall and interaction-induced quantum anomalous Hall effects.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: SC0018945; SC0020149

OSTI ID:: 1819966

Alternate ID(s):: OSTI ID: 1852725

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 36 Vol. 118; ISSN 0027-8424

Publisher:: Proceedings of the National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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