Fano resonance in a quantum wire with a side-coupled quantum dot
Fano resonance in a quantum wire with a side-coupled quantum dot
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DOI：
10.1103/physrevb.70.035319
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发表时间：
2004-07-01
影响因子：
3.7
通讯作者：
Iye, Y
中科院分区：
文献类型：
--
作者：
Kobayashi, K;Aikawa, H;Iye, Y
报道了量子连接线和侧耦合量子点(QD)中Fano效应的输运实验。Fano共振发生在量子点和导线中的“T”形结之间，传输探测到反共振或波函数的前向散射部分。与以前报道的Aharonov-Bohm环型干涉仪相比，在这种几何形状下，要调整共振的形状要困难得多，但共振纯粹是由传输的相干部分组成的。利用这一优势，我们通过考虑热展宽和退相干，定量地分析了Fano效应的温度依赖性。我们还证明了这种几何结构可以作为一种有用的干涉仪来测量电子在量子点上的位相演化。
We report a transport experiment on the Fano effect in a quantum connecting wire with a side-coupled quantum dot (QD). The Fano resonance occurs between the QD and the "T-shaped" junction in the wire, and the transport detects antiresonance or a forward-scattered part of the wave function. While it is more difficult to tune the shape of the resonance in this geometry than in the previously reported Aharonov-Bohm-ring-type interferometer, the resonance purely consists of the coherent part of transport. Utilizing this advantage, we have quantitatively analyzed the temperature dependence of the Fano effect by including the thermal broadening and the decoherence. We have also proven that this geometry can be a useful interferometer for measuring the phase evolution of electrons at a QD.