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arXiv 0909.2778cond-mat.mes-hall
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磁场对单电子非绝热抽运的影响

Non-adiabatic pumping of single electrons affected by magnetic fields

Christoph Leicht, Bernd Kaestner, Vyacheslavs Kashcheyevs, Philipp Mirovsky, Thomas Weimann, Klaus Pierz, Hans-Werner Schumacher

摘要:

研究了垂直磁场作用下AlGaAs/GaAs异质结构中动态量子点对分立电荷的非绝热抽运。将GHz范围内的振荡电压施加到两个顶栅中的一个,穿过窄导线并限制量子点,导致栅极特性中的量化泵浦电流平台。泵浦单个电子的机制可以追溯到进入和离开点的各种隧穿过程。将该理论推广到多电子情形,可以方便地研究外加磁场中的抽运特性。以这种方式,提取了泵浦偶数或奇数电子之间的性质上不同的行为。

英文摘要:

Non-adiabatic pumping of discrete charges, realized by a dynamical quantum dot in an AlGaAs/GaAs heterostructure, is studied under influence of a perpendicular magnetic field. Application of an oscillating voltage in the GHz-range to one of two top gates, crossing a narrow wire and confining a quantum dot, leads to quantized pumped current plateaus in the gate characteristics. The regime of pumping one single electron is traced back to the diverse tunneling processes into and out-of the dot. Extending the theory to multiple electrons allows to investigate conveniently the pumping characteristics in an applied magnetic field. In this way, a qualitatively different behavior between pumping even or odd numbers of electrons is extracted.

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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