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首页> 外文期刊>Physical review >Electrical control of phonon-mediated spin relaxation rate in semiconductor quantum dots: Rashba versus Dresselhaus spin-orbit coupling
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Electrical control of phonon-mediated spin relaxation rate in semiconductor quantum dots: Rashba versus Dresselhaus spin-orbit coupling

机译：半导体量子点中声子介导的自旋弛豫速率的电控制：Rashba与Dresselhaus自旋轨道耦合

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摘要

In symmetric quantum dots (QDs), it is well known that the spin hot spot (i.e., the cusplike structure due to the presence of degeneracy near the level or anticrossing point) is present for the pure Rashba case but is absent for the pure Dresselhaus case [Bulaev and Loss, Phys. Rev. Lett. 95, 076805 (2005)]. Since the Dresselhaus spin-orbit coupling dominates over the Rashba spin-orbit coupling in GaAs and GaSb QDs, it is important to find the exact location of the spin hot spot or the cusplike structure even for the pure Dresselhaus case. In this paper, we present analytical and numerical results that show that the spin hot spot can also be seen for the pure Dresselhaus spin-orbit coupling case by inducing large anisotropy through external gates. At or nearby the spin hot spot, the spin transition rate increases and the decoherence time decreases by several orders of magnitude compared to the case with no spin hot spot. Thus one should avoid such locations when designing QD spin based transistors for possible implementation in quantum logic gates, solid-state quantum computing, and quantum information processing. It is also possible to extract the exact experimental data [Amasha, MacLean, Radu, Zumbuhl, Kastner, Hanson, and Gossard, Phys. Rev. Lett. 100,046803 (2008] for the phonon mediated spin-flip rates from our developed theoretical model.
机译：众所周知，在对称量子点（QD）中，纯Rashba情况存在自旋热点（即，由于在水平或反交叉点附近存在简并而形成的尖状结构），而对于纯Dresserhaus则不存在案例[Bulaev and Loss，Phys。牧师95，076805（2005）]。由于在GaAs和GaSb QD中，Dresselhaus自旋轨道耦合支配着Rashba自旋轨道耦合，因此即使对于纯粹的Dresselhaus情形，找到自旋热点或尖端结构的精确位置也很重要。在本文中，我们给出的分析和数值结果表明，也可以通过通过外部门引起大的各向异性来观察纯Dressresshaus自旋轨道耦合情况的自旋热点。与没有自旋热点的情况相比，在自旋热点处或附近，自旋转变速率增加并且去相干时间减少几个数量级。因此，在设计基于QD自旋的晶体管以在量子逻辑门，固态量子计算和量子信息处理中可能实现时，应该避免这样的位置。也可以提取准确的实验数据[Amasha，MacLean，Radu，Zumbuhl，Kastner，Hanson和Gossard，Phys。牧师100,046803（2008）是我们开发的理论模型中的声子介导的自旋翻转速率。

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