Year: 2020
Type: article
Abstract: Considering the ground state of a quantum spin model as the initial state of the quantum battery, we show that both ordered and disordered interaction strengths play a crucial role in increasing the extraction of power from it. In particular, we demonstrate that exchange interactions in the $xy$ plane and in the $z$ direction, leading to the $XYZ$ spin chain, along with the local charging field in the $x$ direction substantially enhance the efficiency of the battery compared to the model without interactions. Moreover, such an advantage in power obtained due to interactions is almost independent of the system size. We find that the behavior of the power, although measured during dynamics, can faithfully mimic the equilibrium quantum phase transitions present in the model. We observe that with the proper tuning of system parameters, an initial state prepared at finite temperature can generate higher power in the battery than that obtained with zero temperature. Finally, we report that defects or impurities, instead of reducing the performance, can create a larger amount of quenched averaged power in the battery in comparison with the situation when the initial state is produced from the spin chain without disorder, thereby showing the disorder-induced order in dynamics.
Source: Physical Review A
Authors: Srijon Ghosh, Titas Chanda, Aditi Sen(De)
Institutions: Harish-Chandra Research Institute, Jagiellonian University
Language: English
Subfield: Statistical and Nonlinear Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Narodowe Centrum Nauki, QuantERA
Award: G5193596363
OpenAlex ID: W2946971597