The two-hole ground state of the Hubbard-Anderson model, approximated by a variational RVB-type wave function

Traa, M.R.M.J. and Caspers, W.J. and Banning, E.J. (1994) The two-hole ground state of the Hubbard-Anderson model, approximated by a variational RVB-type wave function. Physica A: Theoretical and statistical physics, 203 (1). pp. 145-158. ISSN 0378-4371

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Abstract:	In this paper the Hubbard-Anderson model on a square lattice with two holes is studied. The ground state (GS) is approximated by a variational RVB-type wave function. The holes interact by exchange of a localized spin excitation (SE), which is created or absorbed if a hole moves to a nearest-neighbour site. An SE can move over the sublattice on which it is created. A variational calculation of the GS and the GS-energy is performed for an open-ended 4 × 4 lattice with two holes with the restriction that the SE is neighbouring both holes and does not move over its sublattice. It is found that the two holes prefer a bound state in which their mutual distance is 1 or V2 (with lattice spacing 1).
Item Type:	Article
Copyright:	© 1994 Elsevier Science
Research Group:	Theoretical Physics
Link to this item:	http://purl.utwente.nl/publications/24803
Official URL:	http://dx.doi.org/10.1016/0378-4371(94)90037-X
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