Fibonacci-Hubbard Chain at Zero and Finite Temperatures

TL;DR

This paper investigates how Fibonacci modulation and electronic interactions influence the ground state and conductivity of finite Hubbard chains at various temperatures, revealing a competition that can enhance conductivity.

Contribution

It presents a mean field analysis of finite-sized Fibonacci-modulated Hubbard chains, exploring the interplay between electronic interactions and quasi-periodic modulation on their properties.

Findings

Conductivity decreases with strong interactions or modulation.

Competition between interactions and modulation can enhance conductivity.

Finite temperature effects reveal unique features of these systems.

Abstract

We have studied finite-sized single band Hubbard chains with Fibonacci modulation for half filling within a mean field approximation. The ground state properties, together with the dc conductivity both at zero and non-zero temperatures, are calculated for such quasi-periodic Hubbard chains. While a reduction in the conductivity is found for strong electronic interaction or strong Fibonacci modulation, a competition between these two is observed to enhance the conductivity. The results at finite temperatures also illustrate some interesting features of such finite-sized systems.