Polarized Superfluidity in the imbalanced attractive Hubbard model

TL;DR

This paper explores how spin imbalance affects superfluidity in the attractive Hubbard model using dynamical mean-field theory, revealing significant changes in the density of states.

Contribution

It introduces a method to study polarized superfluidity in the imbalanced attractive Hubbard model with a focus on density of states changes.

Findings

Spin imbalance induces drastic changes in the density of states.

The superfluid order parameter and magnetization are analyzed in the imbalanced system.

The study provides insights into polarized superfluid states at quarter filling.

Abstract

We investigate the attractive Hubbard model in infinite spatial dimensions by means of dynamical mean-field theory. Using a continuous-time Monte Carlo algorithm in the Nambu formalism as an impurity solver, we directly deal with the superfluid phase in the population imbalanced system. By calculating the superfluid order parameter, the magnetization, and the density of states, we discuss how the polarized superfluid state is realized in the attractive Hubbard model at quarter filling. We find that a drastic change in the density of states is induced by spin imbalanced populations in the superfluid state.