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Two holes in a two-dimensional quantum antiferromagnet: A variational study based on entangled-plaquette states | | Fabio Mezzacapo
; Adriano Angelone
; Guido Pupillo
; | | Date: |
13 Oct 2016 | | Abstract: | 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 $0.4leq J/ tleq2.0$. 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 $J/t<J_c/tsimeq 0.19$. | | Source: | arXiv, 1610.4205 | | Services: | Forum | Review | PDF | Favorites | |
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