Time-resolved quantum spin transport through an Aharonov–Casher ring

Can Li,Chenglong Jia,Dongxing Yu,Yaojin Li

doi:10.1088/1367-2630/aadfa4

Can Li, Chenglong Jia + Show 2 more

Open Access

https://doi.org/10.1088/1367-2630/aadfa4

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Abstract

After obtaining an exact analytical time-varying solution for the Aharonov–Casher conducting ring embedded in a textured static/dynamic electric field, we investigate the spin-resolved quantum transport in the structure. It is shown that the interference patterns are governed by not only the Aharonov–Casher geometry phase but also the instantaneous phase difference of spin precession through different traveling paths. This dynamic phase is determined by the strength of the applied electric field and can have substantial effects on the charge/spin conductances, especially in the weak field regime as the period of spin precession comparable to that of the orbital motion. Our studies suggest that a low-frequency normal electric field with moderate strength possesses more degrees of freedom for manipulating the spin interference of incident electrons.

Highlights

After obtaining an exact analytical time-varying solution for the Aharonov-Casher conducting ring embedded in a textured static/dynamic electric field, we investigate the spin-resolved quantum transport in the structure
It is shown that the interference patterns are governed by the Aharonov-Casher geometry phase and the instantaneous phase difference of spin precession through different traveling paths
This dynamic phase is determined by the strength of applied electric field and can have substantial effects on the charge/spin conductances, especially in the weak field regime as the period of spin precession comparable to that of the orbital motion

Summary

Introduction

After obtaining an exact analytical time-varying solution for the Aharonov-Casher conducting ring embedded in a textured static/dynamic electric field, we investigate the spin-resolved quantum transport in the structure. Such the electric field-tunable RSOI can be achieved as well on the Aharonov-Casher (AC) effect17 in mesoscopic ring structures16,18,19. It should be noted that the spinor wave-functions used to investigate the spin interference effects in experiment and theory are not time-dependent even though the spin precession in quantum transport is always there.

Results

Conclusion