Superfluid state in the periodic Anderson model with attractive interactions

TL;DR

This paper explores the phase transition between superfluid and Kondo insulating states in the attractive periodic Anderson model using DMFT and quantum Monte Carlo methods, revealing a characteristic low-energy peak at the transition.

Contribution

It provides a detailed phase diagram and insights into the superfluid state in the attractive periodic Anderson model, including effects of confining potential in optical lattices.

Findings

Identification of a low-energy peak inside the hybridization gap at the phase transition

Demonstration of the competition between superfluid and Kondo insulating states

Analysis of the effect of confining potential in optical lattice systems

Abstract

We investigate the periodic Anderson model with attractive interactions by means of dynamical mean-field theory (DMFT). Using a continuous-time quantum Monte Carlo impurity solver, we study the competition between the superfluid state and the paramagnetic Kondo insulating state, and determine the phase diagram. At the chemical potential-induced phase transition from the Kondo insulating state to the superfluid state, a low-energy peak characteristic of the superfluid state appears inside the hybridization gap. We also address the effect of the confining potential in optical lattice systems by means of real-space DMFT calculations.