Backward Scattering and Coexistent State in Two-Dimensional Electron System

TL;DR

This paper investigates how backward scattering influences various ordered states in two-dimensional electron systems, revealing the stabilization of coexistent phases like d-wave superconductivity and antiferromagnetism near half filling.

Contribution

It extends mean field studies to diverse Fermi surface types and coupling constants, demonstrating the general stability of coexistent states in these systems.

Findings

Coexistent state of d-wave superconductivity, antiferromagnetism, and π-triplet pairs can be stabilized.

Backward scattering effects are significant near half filling.

Results are applicable across various Fermi surface configurations.

Abstract

The results of the mean field studies on the effects of the backward scattering with large momentum transfer in a two-dimensional electron system are extended to the case with various types of the Fermi surface and coupling constants. It is found that the coexistent state of d-wave superconductivity, antiferromagnetism and $\pi$-triplet pair can be stabilized quite generally near half filling.