Study of quantum Stirling heat engine in Tsallis formalism under Dzyaloshinskii-Moriya interaction

The subject of quantum heat engine (QHE) is an interesting challenge in condensed matter physics. The Stirling QHE is a groundbreaking advancement in the field of quantum machines. The machine can be employed as an efficient heat engine and an innovative refrigerator. In this work, the property of the Stirling QHE is examined by treating its working substance as a two-qubit Heisenberg model, taking into account the Dzyaloshinskii-Moriya (DM) interaction, and a magnetic field within the framework of Tsallis formalism. The novelty of the work is to use nonextensive thermodynamics in studying the quantum Stirling engine. We investigate the influence of the nonextensive Tsallis parameter ([Formula: see text], DM parameter and magnetic field on various aspects of the Stirling heat engine, including absorbed heat, released heat, work done and efficiency. The findings show that the nonextensive parameter has an important role in efficiency. The best value for the efficiency of this QHE can be obtained by setting sufficient values for the system parameters such as nonextensive parameter, DM parameter and magnetic field. Here, we obtained a maximum value of 0.4 for the efficiency of the QHE at [Formula: see text].