Metal-Insulator transition in optical lattice system with site-dependent interactions

TL;DR

This paper studies a half-filled Hubbard model with alternating interactions using two-site dynamical mean-field theory, revealing a single Mott transition and analyzing the nature of the resulting states.

Contribution

It demonstrates that a single Mott transition occurs despite spatially varying interactions, showing their irrelevance at the critical point.

Findings

A single Mott transition occurs with increasing interactions.

Different interactions become irrelevant at the critical point.

The nature of the Mott states is characterized.

Abstract

We investigate the half-filled Hubbard model with spatially alternating interactions by means of the two-site dynamical mean-field theory. It is found that a single Mott transition occurs when two kinds of interactions are increased. This implies that the different interactions are essentially irrelevant at the critical point. The nature of the Mott states is also addressed.