Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge and Spin Structures of a $d_{x^2 - y^2}$ Superconductor in the
  Proximity of an Antiferromagnetic Mott Insulator   To the Hubbard model on a square lattice we add an interaction, $W$, which
depends upon the square of a near-neighbor hopping. We use zero temperature
quantum Monte Carlo simulations on lattice sizes up to $16 \times 16$, to show
that at half-filling and constant value of the Hubbard repulsion, the
interaction $W$ triggers a quantum transition between an antiferromagnetic Mott
insulator and a $d_{x^2 -y^2}$ superconductor. With a combination of finite
temperature quantum Monte Carlo simulations and the Maximum Entropy method, we
study spin and charge degrees of freedom in the superconducting state. We give
numerical evidence for the occurrence of a finite temperature
Kosterlitz-Thouless transition to the $d_{x^2 -y^2}$ superconducting state.
Above and below the Kosterlitz-Thouless transition temperature, $T_{KT}$, we
compute the one-electron density of states, $N(\omega)$, the spin relaxation
rate $1/T_1$, as well as the imaginary and real part of the spin susceptibility
$\chi(\vec{q},\omega)$. The spin dynamics are characterized by the vanishing of
$1/T_1$ and divergence of $Re \chi(\vec{q} = (\pi,\pi), \omega = 0)$ in the low
temperature limit. As $T_{KT}$ is approached $N(\omega)$ develops a pseudo-gap
feature and below $T_{KT}$ $Im \chi(\vec{q} = (\pi,\pi), \omega)$ shows a peak
at finite frequency.

18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess