a H.H. Wills Physics Laboratory, University of Bristol, Tyndall Ave., Bristol BS8 1TL, UK
b Department of Physics, Cornell University, Ithaca, NY, USA
Abstract:
We study a simple tight-binding (Hubbard) model for electrons interacting via a short range attractive potential. We show that on a cubic lattice, for a half-filled band the ground state may feature both superconductivity and a charge density wave. We examine the response of such a ground state to an external magnetic field and describe the effect of the charge density wave on the Meissner effect.