Transmission phase lapses in quantum dots: the role of dot-lead coupling asymmetry

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dc.creatorGolosov, D. I.
dc.creatorGefen, Yuval
dc.date2006-12-19
dc.date2007-03-19
dc.date.accessioned2026-07-07T08:00:51Z
dc.date.available2026-07-07T08:00:51Z
dc.descriptionLapses of transmission phase in transport through quantum dots are ubiquitous already in the absence of interaction, in which case their precise location is determined by the signs and magnitudes of the tunnelling matrix elements. However, actual measurements for a quantum dot embedded in an Aharonov-Bohm interferometer show systematic sequences of phase lapses separated by Coulomb peaks -- an issue that attracted much attention and generated controversy. Using a two-level quantum dot as an example we show that this phenomenon can be accounted for by the combined effect of asymmetric dot-lead couplings (left lead/right lead asymmetry as well as different level broadening for different levels) and interaction-induced "population switching" of the levels, rendering this behaviour generic. We construct and analyse a mean field scheme for an interacting quantum dot, and investigate the properties of the mean field solution, paying special attention to the character of its dependence (continuous vs. discontinuous) on the chemical potential or gate voltage.
dc.description34 LaTeX pages in IOP format, 9 figures; misprints corrected
dc.identifierhttps://arxiv.org/abs/cond-mat/0612494
dc.identifierhttp://arxiv.org/abs/cond-mat/0612494
dc.identifierNew J. Phys. vol. 9, 120 (2007)
dc.identifierdoi:10.1088/1367-2630/9/5/120
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/128779
dc.subjectStrongly Correlated Electrons
dc.subjectMesoscale and Nanoscale Physics
dc.titleTransmission phase lapses in quantum dots: the role of dot-lead coupling asymmetry
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