Superconductivity from repulsion: a variational view

Shastry, Sriram B (1999) Superconductivity from repulsion: a variational view. In: Journal of Physics A: Mathematical and General, 32 (29). L345-L352.

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Abstract

This letter presents a new class of variational wavefunctions for Fermi systems in any dimension. These wavefunctions introduce correlations between Cooper pairs in different momentum states and the relevant correlations can be computed analytically. At half filling we have a ground state with critical superconducting correlations, that causes negligible increase of the kinetic energy. We find large enhancements in a Cooper-pair correlation function caused purely by the interplay between the uncertainty principle, repulsion and the proximity of half filling. This is surprising since there is no accompanying signature in usual charge and spin response functions, and typifies a novel kind of many-body cooperative behaviour.

Item Type:	Editorials/Short Communications
Publication:	Journal of Physics A: Mathematical and General
Publisher:	Institute of Physics
Additional Information:	Copyright of this article belongs to Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	30 Jun 2011 08:13
Last Modified:	17 Oct 2018 11:21
URI:	http://eprints.iisc.ac.in/id/eprint/38817

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