Topological Insulators in Twisted Transition Metal Dichalcogenide Homobilayers

Wu, Fengcheng; Lovorn, Timothy; Tutuc, Emanuel; Martin, Ivar; MacDonald, A. H.

doi:10.1103/PhysRevLett.122.086402

Title: Topological Insulators in Twisted Transition Metal Dichalcogenide Homobilayers

Journal Article · Thu Feb 28 00:00:00 EST 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.086402· OSTI ID:1500107

Wu, Fengcheng ^[1]; Lovorn, Timothy ^[2]; Tutuc, Emanuel ^[3]; Martin, Ivar ^[4]; MacDonald, A. H. ^[2]

Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
Univ. of Texas at Austin, Austin, TX (United States)
The Univ. of Texas at Austin, Austin, TX (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

We show that moiré bands of twisted homobilayers can be topologically nontrivial, and illustrate the tendency by studying valence band states in ±K valleys of twisted bilayer transition metal dichalcogenides, in particular, bilayer MoTe₂. Because of the large spin-orbit splitting at the monolayer valence band maxima, the low energy valence states of the twisted bilayer MoTe₂ at the +K (–K) valley can be described using a two-band model with a layer-pseudospin magnetic field Δ(r) that has the moiré period. We show that Δ(r) has a topologically nontrivial skyrmion lattice texture in real space, and that the topmost moiré valence bands provide a realization of the Kane-Mele quantum spin-Hall model, i.e., the two-dimensional time-reversal-invariant topological insulator. As a result, the bands narrow at small twist angles, a rich set of broken symmetry insulating states can occur at integer numbers of electrons per moiré cell.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Welch Foundation; USDOE

Grant/Contract Number:: AC02-06CH11357; W911NF-17-1-0312; TBF1473

OSTI ID:: 1500107

Alternate ID(s):: OSTI ID: 1546358

Journal Information:: Physical Review Letters, Vol. 122, Issue 8; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 190 works

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