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arXiv 1209.4447cond-mat.mes-hall
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用于半导体量子线路的可调谐电荷探测器

Tunable Charge Detectors for Semiconductor Quantum Circuits

Clemens Rössler, Tobias Krähenmann, Stephan Baer, Thomas Ihn, Klaus Ensslin, Christian Reichl, Werner Wegscheider

摘要:

在高迁移率的二维电子系统中定义的纳米结构提供了一种独特的方式来控制所研究的器件的微观细节。量子点接触在这些研究中起着关键作用,因为它们本身不仅是一个研究课题,而且可以作为其静电环境的方便和强大的探测器。我们研究了如何通过减少屏蔽、增加电荷和检测器之间的电容耦合以及将量子点接触的限制电势调整为局域态的形状来进一步提高电荷检测器的灵敏度。我们证明了利用局域态的好处,通过执行快速和良好分辨的电荷检测的一个大的量子点在量子霍尔制度。

英文摘要:

Nanostructures defined in high-mobility two-dimensional electron systems offer a unique way of controlling the microscopic details of the investigated device. Quantum point contacts play a key role in these investigations, since they are not only a research topic themselves, but turn out to serve as convenient and powerful detectors for their electrostatic environment. We investigate how the sensitivity of charge detectors can be further improved by reducing screening, increasing the capacitive coupling between charge and detector and by tuning the quantum point contacts' confinement potential into the shape of a localized state. We demonstrate the benefits of utilizing a localized state by performing fast and well-resolved charge detection of a large quantum dot in the quantum Hall regime.

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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