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Electromagnetic pulse-driven spin-dependent currents in semiconductor quantum rings.

Zhen-Gang Zhu¹, Jamal Berakdar

¹Institut für Physik, Martin-Luther Universität Halle-Wittenberg, Heinrich-Damerow-Straße 4 06120 Halle, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|August 10, 2011

Summary

This summary is machine-generated.

We studied quantum ring currents driven by electromagnetic pulses. Rashba spin-orbit interaction and pulse parameters control charge and spin currents, with larger rings showing longer oscillation periods.

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Area of Science:

Condensed Matter Physics
Quantum Mechanics
Spintronics

Background:

Quantum rings are crucial in nanoscale electronics.
Spin-orbit interaction (SOI) significantly influences electron behavior in quantum systems.
Understanding non-equilibrium dynamics is key for advanced quantum devices.

Purpose of the Study:

To investigate non-equilibrium charge and spin-dependent currents in a quantum ring.
To analyze the role of Rashba spin-orbit interaction (SOI) and external magnetic flux.
To explore the influence of asymmetric electromagnetic pulses on current dynamics.

Main Methods:

Theoretical investigation of quantum transport in a nanoscale ring.
Modeling the system's response to two asymmetric picosecond electromagnetic pulses.
Analysis of both equilibrium and non-equilibrium persistent charge and spin currents.

Main Results:

Dynamical charge and spin currents vary smoothly with static external magnetic flux.
Rashba SOI acts as an effective SU(2) flux, modifying current phases.
Oscillation period of charge current depends on ring radius and pulse delay time.
Pulse field parameters offer a degree of control over total charge and spin currents.

Conclusions:

The study elucidates the complex interplay between SOI, external fields, and electromagnetic pulses in quantum rings.
Findings are applicable to nanometre rings in III-V and II-VI semiconductor heterojunctions.
Provides insights for designing and controlling spintronic devices based on quantum rings.