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Lifting of spin blockade by charged impurities in Si-MOS double quantum dot devices

机译:通过在Si-MOS双量子点装置中用带电杂质提取旋转封锁

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摘要

One obstacle that has slowed the development of electrically gated metal-oxide-semiconductor (MOS) singlet-triplet qubits is the frequent lack of observed spin blockade, even in samples with large singlet-triplet energy splittings. We present theoretical and experimental evidence that this problem in MOS double quantum dots can be caused by stray positive charges in the oxide, inducing accidental localized levels near the device's active region that lead to the lifting of the spin blockade. We also present evidence that these effects can be mitigated by device design modifications, such as overlapping gates.
机译:一种速度减慢了电控金属氧化物 - 氧化物半导体(MOS)单态三态Qubits的障碍是频繁缺乏观察到的旋转阻滞,即使在具有大单向三联能量分裂的样本中也是如此。我们提出了理论和实验证据,即MOS双量子点中的该问题可以是氧化物中的杂散正电荷引起的,诱导器件的有源区附近的意外局部水平导致旋转旋转的旋转。我们还提出了这些效果,可以通过设备设计修改来减轻这些效果,例如重叠门。

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  • 来源
    《Physical review》 |2020年第15期|155411.1-155411.11|共11页
  • 作者单位

    Department of Physics University of Wisconsin-Madison Madison Wisconsin 53706 USA;

    Department of Physics and Astronomy University of California Los Angeles Los Angeles California 90095 USA;

    Instituto de Ciencia de Materiales de Madrid ICMM-CSIC Cantoblanco E-28049 Madrid (Spain);

    Instituto de Fisica Universidade Federal do Rio de Janeiro C.P. 68528 21941-972 Rio de Janeiro Brazil;

    Instituto de Fisica Universidade Federal do Rio de Janeiro C.P. 68528 21941-972 Rio de Janeiro Brazil School of Electrical Engineering and Telecommunications The University of New South Wales Sydney NSW 2052 Australia;

    Department of Physics University at Buffalo SUNY Buffalo New York 14260-1500 USA;

    Department of Physics and Astronomy University of California Los Angeles Los Angeles California 90095 USA;

    Department of Physics University of Wisconsin-Madison Madison Wisconsin 53706 USA;

    Department of Physics University of Wisconsin-Madison Madison Wisconsin 53706 USA School of Physics The University of New South Wales Sydney NSW 2052 Australia;

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