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• W2963168260 abstract "We show that moir'e bands of twisted homobilayers can be topologically nontrivial, and illustrate the tendency by studying valence band states in $pm K$ valleys of twisted bilayer transition metal dichalcogenides, in particular, bilayer MoTe$_2$. Because of the large spin-orbit splitting at the monolayer valence band maxima, the low energy valence states of the twisted bilayer MoTe$_2$ at $+K$ ($-K$) valley can be described using a two-band model with a layer-pseudospin magnetic field $boldsymbol{Delta}(boldsymbol{r})$ that has the moir'e period. We show that $boldsymbol{Delta}(boldsymbol{r})$ has a topologically non-trivial skyrmion lattice texture in real space, and that the topmost moir'e valence bands provide a realization of the Kane-Mele quantum spin-Hall model, i.e., the two-dimensional time-reversal-invariant topological insulator. Because the bands narrow at small twist angles, a rich set of broken symmetry insulating states can occur at integer numbers of electrons per moir'e cell." @default.
• W2963168260 created "2019-07-30" @default.
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• W2963168260 date "2019-02-28" @default.
• W2963168260 modified "2023-10-17" @default.
• W2963168260 title "Topological Insulators in Twisted Transition Metal Dichalcogenide Homobilayers" @default.
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• W2963168260 doi "https://doi.org/10.1103/physrevlett.122.086402" @default.
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