Intertwined fractional quantum anomalous Hall states and charge density waves
arxiv(2023)
摘要
Motivated by the recent experimental breakthrough on the observation of the
fractional quantum anomalous Hall (FQAH) effects in semiconductor and graphene
moiré materials, we explore the rich physics associated with the
coexistence of FQAH effect and the charge density wave (CDW) order that
spontaneously breaks the translation symmetry. We refer to a state with both
properties as "FQAH-crystal". We show that the interplay between FQAH effect
and CDW can lead to a rich phase diagram including multiple topological phases
and topological quantum phase transitions at the same moiré filling. In
particular, we demonstrate the possibility of direct quantum phase transitions
from a FQAH-crystal with Hall conductivity σ_H = - 2/3 to a trivial CDW
insulator with σ_H = 0, and more interestingly, to a QAH-crystal with
σ_H= -1.
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