# Temperature dependence of Coulomb drag between finite-length quantum wires

## TL;DR

This paper investigates how Coulomb drag between finite-length quantum wires varies with temperature and bias voltage, revealing interference effects and non-Fermi-liquid behavior through oscillations and temperature-dependent amplitude changes.

## Contribution

It provides a detailed analysis of Coulomb drag in finite-length Tomonaga-Luttinger-liquid wires, highlighting temperature effects and interference phenomena not previously characterized.

## Key findings

- Drag current oscillates with bias voltage due to plasmon interference
- Amplitude of oscillations decreases as temperature increases
- Drag resistance decreases with temperature, indicating non-Fermi-liquid physics

## Abstract

We evaluate the Coulomb drag current in two finite-length Tomonaga-Luttinger-liquid wires coupled by an electrostatic backscattering interaction. The drag current in one wire shows oscillations as a function of the bias voltage applied to the other wire, reflecting interferences of the plasmon standing waves in the interacting wires. In agreement with this picture, the amplitude of the current oscillations is reduced with increasing temperature. This is a clear signature of non-Fermi-liquid physics because for coupled Fermi liquids the drag resistance is always expected to increase as the temperature is raised.