Anomalous magnetic response of a quasi-periodic mesoscopic ring in presence of Rashba and Dresselhaus spin-orbit interactions

Abstract

We investigate the properties of persistent charge current driven by magnetic flux in a quasi-periodic mesoscopic Fibonacci ring with Rashba and Dresselhaus spin-orbit interactions. Within a tight-binding framework we work out individual state currents together with net current based on second-quantized approach. A significant enhancement of current is observed in presence of spin-orbit coupling and sometimes it becomes orders of magnitude higher compared to the spin-orbit interaction free Fibonacci ring. We also establish a scaling relation of persistent current with ring size, associated with the Fibonacci generation, from which one can directly estimate current for any arbitrary flux, even in presence of spin-orbit interaction, without doing numerical simulation. The present analysis indeed gives a unique opportunity of determining persistent current and has not been discussed so far.

10 pages, 16 figures (Accepted for Publication in: The European Physical Journal B-Condensed Matter and Complex Systems)

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• Simultaneous spin-based Boolean logic operations with re-programmable functionality
• Unconventional low-field magnetic response of a diffusive ring with spin-orbit coupling
• Effect of spin-orbit interaction on circular current: Pure spin current phenomena within a ring conductor