Interference Effect in Multi-level Transport through a Quantum Dot

Details Interference Effect in Multi-level Transport through a Quantum Dot Interference Effect in Multi-level Transport through a Quantum Dot

2003-12-17

arxiv.org/abs/cond-mat/0312431v2

Journal of the Physical Society of Japan 73, 3235-3238 (2004).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, to appear in J. Phys. Soc. Jpn. (December 15, 2004)

Scientific paper

10.1143/JPSJ.73.3235

We present experimental results and a model to solve the problem of "in-phase Coulomb peaks" observed in transport through a quantum dot. In a marginal region between Coulomb-blockade and open-dot, we have observed Fano-type interference through two energy levels inside the dot, which manifest themselves in two overlapped Coulomb-diamond-like structures in the excitation spectrum. One of the two levels is strongly coupled to the leads and the phase of traversing electrons is locked to it. We have detected the phase change at the vertices and the centers of the larger diamonds through the sign of the Fano's asymmetric parameters supporting the above deduction.

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