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Lapses of transmission phase in transport through quantum dots are ubiquitousalready in the absence of interaction, in which case their precise location isdetermined by the signs and magnitudes of the tunnelling matrix elements.However, actual measurements for a quantum dot embedded in an Aharonov-Bohminterferometer show systematic sequences of phase lapses separated by Coulombpeaks -- an issue that attracted much attention and generated controversy.Using a two-level quantum dot as an example we show that this phenomenon can beaccounted for by the combined effect of asymmetric dot-lead couplings (leftlead/right lead asymmetry as well as different level broadening for differentlevels) and interaction-induced "population switching" of the levels, renderingthis behaviour generic. We construct and analyse a mean field scheme for aninteracting quantum dot, and investigate the properties of the mean fieldsolution, paying special attention to the character of its dependence(continuous vs. discontinuous) on the chemical potential or gate voltage.Comment: 34 LaTeX pages in IOP format, 9 figures; misprints correcte

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