Theory of Correlated Insulator(s) and Superconductor at ν=1 in Twisted WSe_2
arxiv(2024)
摘要
The observation of a superconducting phase, an intertwined insulating phase,
and a continuous transition between the two at a commensurate filling of
ν=1 in bilayers of twisted WSe_2 (tWSe_2) at θ=3.65^0 raises a
number of intriguing questions about the origin of this phenomenology. Starting
with a simplified three-orbital model of tWSe_2, including an on-site and
nearest-neighbor density-density interactions, as well as a chiral-exchange
interaction, we discuss the possibility of a displacement-field induced direct
superconductor to quantum spin-liquid Mott insulator transition at ν=1
using parton mean-field theory. We discuss the nature of these correlated
insulators, their expected evolution with the displacement-field, and their
phenomenological properties. Further experiments will likely help unravel the
mysteries tied to this fascinating experimental platform.
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