Gossamer supercoductivity and the mean field approximation of a new effective Hubbard model

TL;DR

This paper introduces a new 2D Hubbard model considering varied electron occupancy, which leads to a gossamer superconducting state consistent with recent theoretical proposals.

Contribution

It develops a novel effective Hubbard model that captures gossamer superconductivity through a mean field approach, extending prior models.

Findings

The model predicts a gossamer superconducting state.

Mean field solutions align with Laughlin's gossamer superconductor.

New insights into electron occupancy effects in 2D systems.

Abstract

We construct a new effective two-dimensional Hubbard model by taking the different electron occupancy on site into account. The mean field state of the new Hamiltonian gives rise to the gossamer superconducting state proposed by Laughlin recently(cond-mat/0209269).