Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2002-05-21
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 $\pi$.
Gefen Yuval
Oreg Yuval
Silva Alessandro
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