arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1407.3771cond-mat.mes-hall
收藏

半导体量子点中的几何自旋操纵

Geometric spin manipulation in semiconductor quantum dots

Sanjay Prabhakar, Roderick Melnik, Akira Inomata

摘要:

我们提出了一种通过量子点的绝热输运来完全翻转自旋的方法。我们证明了通过在量子点的自旋态上引入几何相位来翻转自旋是可能的。我们估计的几何自旋翻转时间(约2皮秒),这原来是远远短于实验报告的退相干时间(约。100纳秒),这将提供在达到退相干之前翻转自旋的替代手段。重要的是,Rashba耦合和Dresselhaus耦合都存在,以诱导自旋翻转所需的相位。如果其中之一是缺席,诱导阶段是微不足道的,无关的自旋翻转。

英文摘要:

We propose a method to flip the spin completely by an adiabatic transport of quantum dots. We show that it is possible to flip the spin by inducing a geometric phase on the spin state of a quantum dot. We estimate the geometric spin flip time (approximately 2 pico-sec) which turned out to be much shorter than the experimentally reported decoherence time (approx. 100 nano-sec) that would provide an alternative means of fliping the spin before reaching decoherence. It is important that both the Rashba coupling and the Dresselhaus coupling are present for inducing a phase necessary for spin flip. If one of them is absent, the induced phase is trivial and irrelevant for spin-flip.

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。

↑