Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-12-19
New J. Phys. vol. 9, 120 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
34 LaTeX pages in IOP format, 9 figures; misprints corrected
Scientific paper
10.1088/1367-2630/9/5/120
Lapses 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.
Gefen Yuval
Golosov Denis I.
No associations
LandOfFree
Transmission phase lapses in quantum dots: the role of dot-lead coupling asymmetry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Transmission phase lapses in quantum dots: the role of dot-lead coupling asymmetry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmission phase lapses in quantum dots: the role of dot-lead coupling asymmetry will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-315036