Gossamer Superconductor, Mott Insulator, and Resonating Valence Bond State in Correlated Electron Systems

Details Gossamer Superconductor, Mott Insulator, and Resonating Valence Bond State in Correlated Electron Systems Gossamer Superconductor, Mott Insulator, and Resonating Valence Bond State in Correlated Electron Systems

2002-09-11

arxiv.org/abs/cond-mat/0209272v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.90.207002

Gutzwiller variational method is applied to an effective two-dimensional Hubbard model to examine the recently proposed gossamer superconductor by Laughlin. The ground state at half filled electron density is a gossamer superconductor for smaller intra-site Coulomb repulsion U and a Mott insulator for larger U. The gossamer superconducting state is similar to the resonant valence bond superconducting state, except that the chemical potential is approximately pinned at the mid of the two Hubbard bands away from the half filled.

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