Dephasing in sequential tunneling through a double-dot interferometer

Details Dephasing in sequential tunneling through a double-dot interferometer Dephasing in sequential tunneling through a double-dot interferometer

2003-03-19

arxiv.org/abs/cond-mat/0303397v1

Phys. Rev. B 68, 195305 (2003).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

18 pages, 8 figures; For a tutorial introduction to dephasing see http://iff.physik.unibas.ch/~florian/dephasing/dephasing.htm

Scientific paper

10.1103/PhysRevB.68.195305

We analyze dephasing in a model system where electrons tunnel sequentially through a symmetric interference setup consisting of two single-level quantum dots. Depending on the phase difference between the two tunneling paths, this may result in perfect destructive interference. However, if the dots are coupled to a bath, it may act as a which-way detector, leading to partial suppression of the phase-coherence and the reappearance of a finite tunneling current. In our approach, the tunneling is treated in leading order whereas coupling to the bath is kept to all orders (using P(E) theory). We discuss the influence of different bath spectra on the visibility of the interference pattern, including the distinction between "mere renormalization effects" and "true dephasing".

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