Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum crystal phase of electron liquid   A new bosonic, excitonic method for interacting electrons is developed. For
two-dimensional electron liquid, it reveals a noncompensated quantum crystal
phase ranging from the high density, or vanishing Coulomb interaction, limit:
$r_s=0$, to a lower density $r_s\sim 10$, where a condensation of exciton pairs
and the loss of the Fermi step is possible. The correlation energy and the
static susceptibility, calculated using the method, are in agreement with the
independent studies. A proof of the instability of the Fermi surface in the
limit $r_s\to 0$ is given. The concept of quantum crystal is capable to explain
the metal-insulator transition in Si field-effect heterostructures.

27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex