The Signs of Quantum Dot-Lead Matrix Elements: The Effect on Transport vs. Spectral Properties

Details The Signs of Quantum Dot-Lead Matrix Elements: The Effect on Transport vs. Spectral Properties The Signs of Quantum Dot-Lead Matrix Elements: The Effect on Transport vs. Spectral Properties

2002-05-21

arxiv.org/abs/cond-mat/0205436v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 10 figures

Scientific paper

A small quantum dot coupled to two external leads is considered. Different signs of the dot-leads coupling matrix elements give rise to qualitatively different behavior of physical observables such as the conductance, the phase of the transmission amplitude and the differential capacitance of the dot. For certain relative signs the conductance may vanish at values of the gate potential, where the spectral density is maximal. Zeroes of the conductance are robust against increasing the dot-lead coupling. They are associated with abrupt phase lapses in the transmission phase whose width vanishes as the square of the temperature. We carefully distinguish between phase lapses of $-\pi$ and phase anti-lapses of $\pi$.

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