Hubbard model physics in transition metal dichalcogenide moiré bands

2018/04/30 by Fengcheng Wu, Timothy Lovorn, Emanuel Tutuc +1 · 2 citations
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.121.026402

published as Phys. Rev. Lett. 121, 026402 (2018) · 5+2 pages, 4+1 figures

arxiv created 2018/06/27 · arxiv updated 2018/07/12

Abstract

Flexible long period moir' e superlattices form in two-dimensional van der Waals crystals containing layers that differ slightly in lattice constant or orientation. In this Letter we show theoretically that isolated flat moir' e bands described by generalized triangular lattice Hubbard models are present in twisted transition metal dichalcogenide heterobilayers. The hopping and interaction strength parameters of the Hubbard model can be tuned by varying the twist angle and the three-dimensional dielectric environment. When the flat moiré bands are partially filled, candidate many-body ground states at some special filling factors include spin-liquid states, quantum anomalous Hall insulators and chiral d-wave superconductors.

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