Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two holes in a two-dimensional quantum antiferromagnet: A variational
  study based on entangled-plaquette states   We show that the entangled-plaquette variational ansatz can be adapted to
study the two-dimensional $t-J$ model in the presence of two mobile holes.
Specifically, we focus on a square lattice comprising up to $N=256$ sites in
the parameter range $0.4\leq J/ t\leq2.0$. Ground state energies are obtained
via the optimization of a wave function in which the weight of a given
configuration is expressed in terms of variational coefficients associated with
square and linear entangled plaquettes. Our estimates are in excellent
agreement with exact results available for the $N=16$ lattice. By extending our
study to considerably larger systems we find, based on the analysis of the long
distance tail of the probability of finding two holes at spatial separation
$r$, and on our computed two-hole binding energies, the existence of a two-hole
bound state for all the values of $J/t$ explored here. It is estimated that
d-wave binding of the two holes does not occur for $J/t<J_c/t\simeq 0.19$.

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The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph