Switching of the information backflow between a helical spin system and non-Markovian bath

TL;DR

This paper investigates the dynamics of a helical spin system coupled to a non-Markovian bath, revealing how external electric and magnetic fields can control the flow of information between the system and environment.

Contribution

It demonstrates the control of information backflow directions in a helical spin system via external electric and magnetic fields, highlighting new ways to manipulate non-Markovian dynamics.

Findings

Sign of the trace distance derivative alternates over time.

External electric and magnetic fields influence the information flow.

Magnetic field causes rapid positive-negative transitions.

Abstract

The dissipative dynamics of the spin chain coupled to the non-Markovian magnonic reservoir was studied. The chirality of the chain is formed due to the magnetoelectric coupling. We explored the sign of the trace distance derivative and found the alternating positive/negative periods in system's time evolution. The negative sign is associated with the flow of information from the system to the bath and decrease in states distinguishability, while the positive sign is related to the flow of the information in the opposite direction and increase in distinguishability. We found the distinct effect of the applied electric and magnetic fields. While the Dzyaloshinskii-Moriya interaction and external electric field lead to reshuffling of the periods, the applied magnetic field leads to the swift positive-negative transitions. Thus, in the helical quantum rings coupled to the non-Markovian magnonic baths, it is possible to control the directions of information flow through the external fields.