Dynamical exchange and phase induced switching of a localized molecular spin

TL;DR

This paper investigates how external voltage pulses induce a recurring 4π-periodic switching of a localized molecular spin, revealing the roles of dynamical exchange interactions and transient fields in non-equilibrium conditions.

Contribution

It introduces a generalized spin equation of motion that accounts for anisotropic fields and non-adiabatic dynamics, explaining the spin switching phenomena.

Findings

Recurring 4π-periodic spin switching under voltage pulses

Dynamical exchange interactions drive the switching

Transient internal fields influence spin dynamics

Abstract

The dynamics of a localized molecular spin under the influence of external voltage pulses is addressed using a generalized spin equation of motion. The approach incorporates anisotropic fields, non-equilibrium conditions, and non-adiabatic dynamics. By application of a voltage pulse of temporal length $\tau$, a recurring $4\pi$-periodic switching of the localized spin is observed. The switching phenomena can be explained by dynamical exchange interactions, internal transient fields, and self-interactions acting on the localized spin moment.