Asian Network School and Workshop on Complex Condensed Matter Systems 2023
Hanoi, 6-10 November 2023


P.26 -- Poster, ANSWCCMS-2023

Date: Tuesday, 7 November 2023

Time: 13:00 - 14:30

Enhanced Efficiency of a Quantum Otto Engine Based on an XX Spin Chain near its Dynamical Phase Transition

Acosta, GAJ, G. (1,2), Villagonzalo, C, D. (2)

(1) Palawan State University, (2) University of the Philippines Diliman

Implementation of heat engines in the nanoscale must consider quantum effects. In this study, a quantum Otto engine with an XX spin chain as a working substance was investigated near its dynamical phase transition for its efficiency enhancement. We used two isothermal and two isomagnetic branches for the thermodynamic cycle of the quantum Otto engine. The working substance was operated at the ground state and at a thermal state. The isothermal branches were implemented at zero temperature and inverse temperature $\beta J \geq 1$, while the isomagnetic branches at constant $\left|\frac{\lambda}{J}\right|< 2$. The quantum heat engine was found to achieve a $100\%$ peak efficiency near the ground state curve in the chemical potential diagram and operates at constant $100\%$ efficiency for extended regions when the system undergoes dynamical phase transition.

Presenter: Acosta Gabo Geronimo Allan Jerome

Institute of Physics, VAST   |   Center for Theoretical Physics   |   Center for Computational Physics

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