arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0902.1845cond-mat.mes-hall
收藏

电磁脉冲驱动半导体量子环中的自旋相关电流

Electromagnetic Pulse Driven Spin-dependent Currents in Semiconductor Quantum Rings

Zhen-Gang Zhu, Jamal Berakdar

摘要:

研究了在两个非对称皮秒电磁脉冲驱动下,具有Rashba自旋轨道相互作用(SOI)的量子环中的非平衡电荷和自旋相关电流。研究了平衡持续电荷和持续自旋相关电流。结果表明,动态电荷和动态自旋相关电流随静态外磁通量的变化是平滑的,SOI提供的SU(2)有效磁通改变了动态电荷和动态自旋相关电流的相位.在半径较大的量子环中,总电荷电流随脉冲间延迟时间的振荡周期较大。脉冲场的参数在一定程度上控制总电荷和总自旋相关电流。计算适用于在含有数百个电子的III-V族和II-VI族半导体异质结中制造的纳米环。

英文摘要:

We investigate the non-equilibrium charge and spin-dependent currents in a quantum ring with a Rashba spin orbit interaction (SOI) driven by two asymmetric picosecond electromagnetic pulses. The equilibrium persistent charge and persistent spin-dependent currents are investigated as well. It is shown that the dynamical charge and the dynamical spin-dependent currents vary smoothly with a static external magnetic flux and the SOI provides a SU(2) effective flux that changes the phases of the dynamic charge and the dynamic spin-dependent currents. The period of the oscillation of the total charge current with the delay time between the pulses is larger in a quantum ring with a larger radius. The parameters of the pulse fields control to a certain extent the total charge and the total spin-dependent currents. The calculations are applicable to nano-meter rings fabricated in heterojuctions of III-V and II-VI semiconductors containing several hundreds electrons.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑