Hybrid interacting quantum Hall thermal machine

TL;DR

This paper explores a hybrid quantum Hall thermal machine using a quantum dot coupled to edge states, demonstrating multiple operational regimes and robustness against interactions, with potential for enhanced performance.

Contribution

It introduces a novel hybrid quantum Hall thermal machine setup that can operate as an engine, heat pump, or refrigerator, including coexistence regimes and interaction effects.

Findings

Multiple operational regimes identified

Robustness against electron-electron interactions

Potential for performance enhancement

Abstract

We investigate a hybrid thermal machine based on a single closed quantum Hall edge channel forming a quantum dot. It is tunneling coupled with two quantum Hall states at $\nu = 2$ in contact with reservoirs at different temperatures and chemical potentials. One of these edge states is also driven out-of-equilibrium by means of a periodic train of Lorentzian voltage pulses. This device allows to explore various possible working regimes including the engine, the heat pump and the refrigerator configuration. Regions where two regimes coexist can also be identified. Moreover, the proposed set-up exhibits robustness and in some parameter regions also slightly enhanced performance in the presence of electron-electron interactions.