Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Signatures of bilayer Wigner crystals in a transition metal
  dichalcogenide heterostructure   A Wigner crystal, a regular electron lattice arising from strong correlation
effects, is one of the earliest predicted collective electronic states. This
many-body state exhibits quantum and classical phase transitions and has been
proposed as a basis for quantum information processing applications. In
semiconductor platforms, two-dimensional Wigner crystals have been observed
under magnetic field or moir\'e-based lattice potential where the electron
kinetic energy is strongly suppressed. Here, we report bilayer Wigner crystal
formation without a magnetic or confinement field in atomically thin MoSe$_2$
bilayers separated by hexagonal boron nitride. We observe optical signatures of
robust correlated insulating states formed at symmetric (1:1) and asymmetric
(4:1 and 7:1) electron doping of the two MoSe$_2$ layers at cryogenic
temperatures. We attribute these features to the bilayer Wigner crystals formed
from two commensurate triangular electron lattices in each layer, stabilized
via inter-layer interaction. These bilayer Wigner crystal phases are remarkably
stable and undergo quantum and thermal melting transitions above a critical
electron density of up to $6 \times10^{12}$ cm$^{-2}$ and at temperatures of
~40 K. Our results demonstrate that atomically thin semiconductors provide a
promising new platform for realizing strongly correlated electronic states,
probing their electronic and magnetic phase transitions, and developing novel
applications in quantum electronics and optoelectronics.

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The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat