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Spin–orbit coupling induced magnetoresistance oscillation in a dc biased two-dimensional electron system
Summary
We investigated how direct current (dc) bias affects magnetoresistance oscillations in a two-dimensional electron gas with Rashba spin-orbit coupling. We found that increasing dc current can halve oscillation periods and even invert magnetoresistance peaks and troughs.
Area of Science:
- Condensed matter physics
- Quantum transport phenomena
Background:
- The Shubnikov-de Haas oscillation in two-dimensional electron gases (2DEGs) is sensitive to magnetic fields and material properties.
- Rashba spin-orbit coupling significantly influences electron behavior in 2DEGs, affecting transport properties.
Purpose of the Study:
- To investigate the impact of direct current (dc) bias on magnetoresistance oscillations in 2DEGs with Rashba spin-orbit coupling.
- To explore nonlinear magnetotransport phenomena under finite dc current conditions.
Main Methods:
- Utilized the balance-equation approach to model nonlinear magnetotransport.
- Analyzed the behavior of magnetoresistance oscillations as a function of dc current density and Rashba coupling strength.
Main Results:
- In the weak current limit, magnetoresistance shows periodic Shubnikov-de Haas oscillations with varying Rashba coupling.
- At finite dc bias, the oscillation period halves when interbranch contributions to resistivity become dominant.
- Increasing current density leads to phase inversion of oscillatory resistivity, with minima and maxima inverting at specific dc bias values.
Conclusions:
- DC current bias introduces significant nonlinear effects on magnetoresistance oscillations in 2DEGs with Rashba spin-orbit coupling.
- Current-induced effects can alter the periodicity and phase of Shubnikov-de Haas oscillations, offering new avenues for controlling quantum transport.
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