Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Universal signatures of Dirac fermions in entanglement and charge
  fluctuations   We investigate the entanglement entropy (EE) and charge fluctuations in
models where the low energy physics is governed by massless Dirac fermions. We
focus on the response to flux insertion which, for the EE, is widely assumed to
be universal, \emph{i.e.}, independent of the microscopic details. We provide
an analytical derivation of the EE and charge fluctuations for the seminal
example of graphene, using the dimensional reduction of its tight-binding model
to the one-dimensional Su-Schrieffer-Heeger model. Our asymptotic expression
for the EE matches the conformal field theory prediction. We show that the
charge variance has the same asymptotic behavior, up to a constant prefactor.
To check the validity of universality arguments, we numerically consider
several models, with different geometries and number of Dirac cones, and either
for strictly two-dimensional models or for gapless surface mode of
three-dimensional topological insulators. We also show that the flux response
does not depend on the entangling surface geometry as long as it encloses the
flux. Finally we consider the universal corner contributions to the EE. We show
that in the presence of corners, the Kitaev-Preskill subtraction scheme
provides non-universal, geometry dependent results.

11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con