Temporal behavior of entanglement between electronic spin and subband states in aRashba nanoloop

Abstract

In this paper we study the entanglement dynamics of spin–subband states for an electronin a quasi-one-dimensional Rashba quantum loop, in a strong perpendicular magnetic field,explicitly including the confining potential and the Rashba spin–orbit couplinginto the entropy, which is a measure of entanglement, as a function of time. Ourresults indicate that the entanglement between the spin states and the structuralsubbands undergoes periodic oscillations. Furthermore, it is shown that the period ofoscillations strongly depends upon the Rashba coupling, while the amplitudes maybe optimized by making proper choices of the external magnetic field. It is alsoshown that the maxima of entanglement, in the long run, oscillate under periodicenvelopes, whose characteristics depend upon the magnetic field. Our results, thereby,provide means of controlling the degree of entanglement by adjusting these agents.