Non-Markovian N-spin chain quantum battery in thermal charging process.

Abstract

Ergotropy serves as a key indicator for assessing the performance of quantum batteries (QBs). Using the Redfield master equation, we investigate ergotropy dynamics in a non-Markovian QB composed of an N-spin chain embedded in a microcavity. Distinct from the Markovian charging process, the thermal charging process exhibits a distinct oscillatory behavior in the extracted ergotropy. We show that these oscillations can be effectively suppressed through coordinated tuning of coherent driving, cavity parameters, and spin-spin couplings. In addition, we analyze the influence of various system and environmental parameters on the time evolution of ergotropy, revealing rich dynamical features. Our results offer insights into the control of energy extraction in QBs and may inform future designs of practical battery architectures.