Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermodynamic singularities in the entanglement entropy at a 2D quantum
  critical point   We study the bipartite entanglement entropy of the two-dimensional (2D)
transverse-field Ising model in the thermodynamic limit using series expansion
methods. Expansions are developed for the Renyi entropy around both the
small-field and large-field limits, allowing the separate calculation of the
entanglement associated with lines and corners at the boundary between
sub-systems. Series extrapolations are used to extract subleading power laws
and logarithmic singularities as the quantum critical point is approached. In
1D, we find excellent agreement with exact results as well as quantum Monte
Carlo simulations. In 2D, we find compelling evidence that the entanglement at
a corner is significantly different from a free boson field theory. These
results demonstrate the power of the series expansion method for calculating
entanglement entropy in interacting systems, a fact that will be particularly
useful in future searches for exotic quantum criticality in models with and
without the sign problem.

7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
3
The categories of this paper are: physics