Rashba diamond in an Aharonov-Casher ring
Xuhui Wang, Aurelien Manchon
TL;DR
This paper theoretically investigates spin interference in a ballistic 2DEG ring with Rashba SOI, revealing a diamond-shaped conductance pattern called Rashba diamond, which enables enhanced control of phase interference.
Contribution
It introduces the concept of Rashba diamond in a 2DEG ring, demonstrating how bias voltage and SOI can be used to manipulate electronic interference patterns.
Findings
Differential conductance exhibits a diamond-shaped pattern due to spin interference.
The Rashba diamond pattern can be controlled by bias voltage and SOI strength.
The study provides a theoretical framework for spin-based quantum interference manipulation.
Abstract
Spin interference due to Rashba spin-orbit interaction (SOI) in a ballistic two-dimensional electron gas (2DEG) ring conductor submitted to a bias voltage is investigated theoretically. We calculate the scattering matrices and differential conductance with lead-ring junction coupling as an adjustable parameter. Due to the interference of electronic waves traversing the ring, the differential conductance modulated by both bias voltage and SOI exhibits a diamond-shaped pattern, thus termed as \ti{Rashba diamond}. This feature offers a supplementary degree of freedom to manipulate phase interference.
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