Fate and origin of the quantum Otto heat engine based on the dissipative Dicke-Hubbard model

TL;DR

This paper investigates a quantum Otto heat engine based on the Dicke-Hubbard model, revealing how superradiance phase transitions influence engine performance and establishing a link between quantum phase transitions and thermodynamic applications.

Contribution

It introduces a novel analysis of a quantum Otto engine using the Dicke-Hubbard model, connecting superradiance phase transitions with thermodynamic efficiency.

Findings

High-performance engine regimes are linked to superradiance phase transitions.

Atom-light coupling and inter-cavity hopping significantly affect engine modes.

The work provides a theoretical basis for designing quantum heat engines.

Abstract

The Dicke-Hubbard model, describing an ensemble of interacting atoms in a cavity, provides a rich platform for exploring collective quantum phenomena. However, its potential for quantum thermodynamic applications remains largely uncharted. Here, we study a quantum Otto heat engine whose working substance is a system governed by the Dicke-Hubbard Hamiltonian. Through the research on steady-state superradiance phase transitions, it is demonstrated that the steady-state synergistic mechanism under high and low temperature environments is the reason for the emergence of high-performance heat engines. By analyzing the influences of atom-light coupling strength, inter-cavity hopping strength and atom number on the working modes of quantum Otto cycle, it is clarified that the effective working regions of each working mode. This work has established a close connection between superradiance phase transition and the quantum thermodynamic applications. It not only deepens our understanding of the energy conversion mechanism in non-equilibrium quantum thermodynamics but also lays a theoretical foundation for the future experimental design of high-performance quantum Otto heat engines.