Quantum Monte Carlo simulation for the spin-drag conductance of the Hubbard model

TL;DR

This paper uses Quantum Monte Carlo simulations to analyze Coulomb drag effects in the Hubbard model, focusing on spin-dependent conductance and how various interactions influence transconductance.

Contribution

It introduces a Monte Carlo approach to calculate spin-drag conductance in the Hubbard chain with different interaction scenarios.

Findings

Transconductance varies with impurity and interaction types.

Monte Carlo method effectively captures Coulomb drag phenomena.

Results provide insights into spin-dependent transport in correlated systems.

Abstract

In the situation of two electro-statically coupled conductors a current in one conductor may induce a current in the other one. We will study this phenomenon, called Coulomb drag, in the Hubbard chain where the two ``conductors'' are given by fermions with different spin orientation. With the aid of a Monte Carlo (MC) approach which we presented in a recent paper we calculate the Transconductance in different variants of the Hubbard chain (with/without impurity and additional [long-ranged] interactions) for different fillings.