Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantum Critical Universality and Singular Corner Entanglement Entropy
  of Bilayer Heisenberg-Ising model   We consider a bilayer quantum spin model with anisotropic intra-layer
exchange couplings. By varying the anisotropy, the quantum critical phenomena
changes from XY to Heisenberg to Ising universality class, with two, three and
one modes respectively becoming gapless simultaneously. We use series expansion
methods to calculate the second and third Renyi entanglement entropies when the
system is bipartitioned into two parts. Leading area-law terms and subleading
entropies associated with corners are separately calculated. We find clear
evidence that the logarithmic singularity associated with the corners is
universal in each class. Its coefficient along the Ising critical line is in
excellent agreement with those obtained previously for the transverse-field
Ising model. Our results provide strong evidence for the idea that the
universal terms in the entanglement entropy provide an approximate measure of
the low energy degrees of freedom in the system.

6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph