Entangled quantum Otto heat engines based on two-spin systems with the Dzyaloshinski-Moriya interaction

TL;DR

This paper designs an entangled quantum Otto engine using two-spin systems with Dzyaloshinski-Moriya interaction, analyzing how this interaction affects thermodynamic performance and efficiency bounds.

Contribution

It introduces a quantum Otto engine model based on spin-1/2 systems with DM interaction and derives a new efficiency bound consistent with thermodynamics.

Findings

DM interaction significantly affects heat transfer, work, and efficiency

Engine efficiency is the same for both antiferromagnetic and ferromagnetic couplings

A new upper bound for efficiency is established under non-zero DM interaction

Abstract

We construct an entangled quantum Otto engine based on spin-1/2 systems undergoing Dzyaloshinski-Moriya (DM) interaction within a varying magnetic field. We investigate the influence of the DM interaction on basic thermodynamic quantities, including heat transfer, work done, and efficiency and find that the DM interaction importantly influences the engine's thermodynamics. We obtain an expression for engine efficiency, finding it to yield the same efficiency for antiferromagnetic and ferromagnetic coupling. A new upper bound, nontrivially consistent with the second law of thermodynamics, is derived for engine efficiency in the case of non-zero DM interaction.