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arXiv cond-mat/9702001cond-mat.mes-hall
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通过量子点的失相和隧穿突变:“哪条路径?”干涉仪

Dephasing and the Orthogonality Catastrophe in Tunneling through a Quantum Dot: the ``Which Path?'' Interferometer

I. L. Aleiner, Ned S. Wingreen, Yigal Meir

摘要:

“哪条路?”"干涉仪由Aharonov-Bohm环组成,其中一个臂上内置有一个量子点(QD),另一个量子点接触(QPC)位于QD附近。QPC的透射系数取决于QD的电荷状态。因此,点接触引起通过QD的传输的可控失相,并且充当电子通过环的路径的测量装置。我们计算了由失相和正交性突变引起的Aharonov-Bohm振荡的抑制,即,分别通过在QPC处的真实和虚拟电子-空穴对产生。

英文摘要:

The ``Which Path?'' interferometer consists of an Aharonov-Bohm ring with a quantum dot (QD) built in one of its arms, and an additional quantum point contact (QPC) located close to the QD. The transmission coefficient of the QPC depends on the charge state of the QD. Hence the point contact causes controllable dephasing of transport through the QD, and acts as a measurement device for which path an electron takes through the ring. We calculate the suppression of the Aharonov-Bohm oscillations which is caused both by dephasing and by the orthogonality catastrophe, i.e., respectively, by real and virtual electron-hole pair creation at the QPC.

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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