Phase measurement in the mesoscopic Aharonov-Bohm interferometer
Phase measurement in the mesoscopic Aharonov-Bohm interferometer
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DOI：
10.1103/physrevb.66.115311
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发表时间：
2002-05
影响因子：
3.7
通讯作者：
A. Aharony;O. Entin-Wohlman;B. I. Halperin;Y. Imry
中科院分区：
文献类型：
--
作者：
A. Aharony;O. Entin-Wohlman;B. I. Halperin;Y. Imry
介观固态阿哈罗诺夫-玻姆干涉仪已用于测量通过量子点 (QD) 的谐振量子传输幅度的“本征”相位 ${\ensuremath{\alpha}}_{\mathrm{QD}},$。对于保存电子电流的两端“闭合”干涉仪，Onsager 关系式要求测得的相移 $\ensuremath{\beta}$ 仅在 0 和 $\ensuremath{\pi} 之间“跳跃”。$ 附加端子打开干涉仪，但 $\ensuremath{\beta}$ 取决于开口的细节。使用理论模型，我们提出了 $\ensuremath{\beta}$ 等于所需的 ${\ensuremath{\alpha}}_{\mathrm{QD}} 的定量标准（可以通过实验测试）：$ QD 附近的“有损”通道应具有较小的传输和较小的反射。
Mesoscopic solid state Aharonov-Bohm interferometers have been used to measure the ``intrinsic'' phase, ${\ensuremath{\alpha}}_{\mathrm{QD}},$ of the resonant quantum transmission amplitude through a quantum dot (QD). For a two-terminal ``closed'' interferometer, which conserves the electron current, Onsager's relations require that the measured phase shift $\ensuremath{\beta}$ only ``jumps'' between 0 and $\ensuremath{\pi}.$ Additional terminals open the interferometer but then $\ensuremath{\beta}$ depends on the details of the opening. Using a theoretical model, we present quantitative criteria (which can be tested experimentally) for $\ensuremath{\beta}$ to be equal to the desired ${\ensuremath{\alpha}}_{\mathrm{QD}}:$ the ``lossy'' channels near the QD should have both a small transmission and a small reflection.