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arXiv 1401.0101cond-mat.mes-hallquant-ph
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强自旋轨道耦合纳米线双量子点中的各向异性交换耦合

Anisotropic exchange coupling in a nanowire double quantum dot with strong spin-orbit coupling

Rui Li, J. Q. You

摘要:

自旋轨道量子位是包含量子点中电子的轨道自由度和自旋自由度的混合量子位。本文研究了具有强自旋轨道耦合(SOC)的纳米线双量子点(DQD)中两个自旋轨道量子比特之间的交换耦合。我们发现,虽然在DQD的总隧穿是无关的SOC,自旋守恒和自旋翻转隧穿是SOC依赖的,可以相互竞争,在强SOC制度。此外,电子之间的库仑排斥可以与SOC相关的隧穿相结合,从而在两个自旋轨道量子比特之间产生各向异性的交换耦合。此外,我们给出了一个明确的物理机制,这种各向异性交换耦合。

英文摘要:

A spin-orbit qubit is a hybrid qubit that contains both orbital and spin degrees of freedom of an electron in a quantum dot. Here we study the exchange coupling between two spin-orbit qubits in a nanowire double quantum dot (DQD) with strong spin-orbit coupling (SOC). We find that while the total tunneling in the DQD is irrelevant to the SOC, both the spin-conserved and spin-flipped tunnelings are SOC dependent and can compete with each other in the strong SOC regime. Moreover, the Coulomb repulsion between electrons can combine with the SOC-dependent tunnelings to yield an anisotropic exchange coupling between the two spin-orbit qubits. Also, we give an explicit physical mechanism for this anisotropic exchange coupling.

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。

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