Kondo metal of fermionic atoms in anisotropic triangular optical lattice

TL;DR

This paper investigates the quantum phase transitions of fermionic atoms in an anisotropic triangular optical lattice, revealing a Mott transition, the emergence of a Kondo metal, and proposing an experimental setup to observe these phenomena.

Contribution

It introduces a detailed phase diagram for the system, highlighting the Kondo metal phase and its suppression of pseudogap, using advanced simulation techniques.

Findings

System undergoes Mott transition at critical interaction.

Kondo peak appears in the density of states.

Pseudogap is suppressed at low temperatures due to Kondo effect.

Abstract

Quantum phase transition of fermionic atoms in anisotropic triangular optical lattice was investigated by dynamical cluster approximation combining with continuous time quantum Monte Carlo algorithm. The temperature-interaction phase diagram for different hoping terms and the competition between the anisotropic parameter and interaction is presented. Our results show that the system undergoes Mott transition from Fermi liquid to Mott insulator while the repulsive interaction reach the critical value. The Kondo metal characterized by Kondo peak in the density of states is found in this systems and the pseudogap are suppressed at low temperature due to the Kondo effect. We also propose a feasible experiment protocol to observe these phenomenon in the anisotropic triangular optical lattice with the cold atoms, in which the hoping terms can be varied by the lattice depth and the atomic interaction can be adjusted via Feshbach resonance.