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arXiv 2104.02568cond-mat.mes-hall
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双孔双量子点中的自旋轨道量子输运通道

Spin-orbit enabled quantum transport channels in a two-hole double quantum dot

Alex Bogan, Sergei Studenikin, Marek Korkusinski, Louis Gaudreau, Jason Phoenix, Piotr Zawadzki, Andy Sachrajda, Lisa Tracy, John Reno, Terry Hargett

摘要:

本文从理论和实验上分析了含两个空穴的栅控横向GaAs双量子点的输运谱。空穴子带中存在的强自旋轨道相互作用解除了泡利自旋阻塞,并允许绘制出双空穴系统的完整光谱。通过在不同失谐和磁场下对源漏电压方向进行测量,我们对Hubbard双位模型进行了定量拟合,该模型考虑了引线的隧道耦合和自旋翻转弛豫过程。我们提取了双空穴基态单重态-三重态跃迁对应的单重态-三重态能隙和磁场。此外,在单重态-三重态跃迁处,我们发现共振增强(在阻塞方向上)和电流抑制(在传导方向上)。电流增强源于双空穴能级的多重共振,一次打开几个导电通道。电流抑制来自自旋守恒和自旋翻转隧穿过程的量子干涉。

英文摘要:

We analyze experimentally and theoretically the transport spectra of a gated lateral GaAs double quantum dot containing two holes. The strong spin-orbit interaction present in the hole subband lifts the Pauli spin blockade and allows to map out the complete spectra of the two-hole system. By performing measurements in both source-drain voltage directions, at different detunings and magnetic fields, we carry out quantitative fitting to a Hubbard two-site model accounting for the tunnel coupling to the leads and the spin-flip relaxation process. We extract the singlet-triplet gap and the magnetic field corresponding to the singlet-triplet transition in the double-hole ground state. Additionally, at the singlet-triplet transition we find a resonant enhancement (in the blockaded direction) and suppression of current (in the conduction direction). The current enhancement stems from the multiple resonance of two-hole levels, opening several conduction channels at once. The current suppression arises from the quantum interference of spin-conserving and spin flipping tunneling processes.

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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