Exciton density waves in Coulomb-coupled dual moiré lattices

Kavli Affiliate: Jie Shan

| First 5 Authors: Yihang Zeng, Zhengchao Xia, Roei Dery, Kenji Watanabe, Takashi Taniguchi

| Summary:

Strongly correlated bosons in a lattice are a platform to realize rich
bosonic states of matter and quantum phase transitions. While strongly
correlated bosons in a lattice have been studied in cold-atom experiments,
their realization in a solid-state system has remained challenging. Here we
trap interlayer excitons–bosons composed of bound electron-hole pairs–in a
lattice provided by an angle-aligned WS2/bilayer WSe2/WS2 multilayer; the
heterostructure supports Coulomb-coupled triangular moir’e lattices of nearly
identical period at the top and bottom interfaces. We observe correlated
insulating states when the combined electron filling factor of the two
lattices, with arbitrary partitions, equals to 1/3,2/3,4/3 and 5/3. These new
states can be interpreted as exciton density waves in a Bose-Fermi mixture of
excitons and holes. Because of the strong repulsive interactions between the
constituents, the holes form robust generalized Wigner crystals , which
restrict the exciton fluid to channels that spontaneously break the
translational symmetry of the lattice. Our results demonstrate that
Coulomb-coupled moir’e lattices are fertile ground for correlated many-boson

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