Tunable pseudogap Kondo effect and quantum phase transitions in Aharonov-Bohm interferometers
Mesoscale and Nanoscale Physics
2009-04-27 v2 Strongly Correlated Electrons
Abstract
We study two quantum dots embedded in the arms of an Aharonov-Bohm ring threaded by a magnetic flux. The system can be described by an effective one-impurity Anderson model with an energy- and flux-dependent density of states. For specific values of the flux, this density of states vanishes at the Fermi energy, yielding a controlled realization of the pseudogap Kondo effect. The conductance and transmission phase shifts reflect a nontrivial interplay between wave interference and interactions, providing clear signatures of quantum phase transitions between Kondo and non-Kondo ground states.
Cite
@article{arxiv.0901.2475,
title = {Tunable pseudogap Kondo effect and quantum phase transitions in Aharonov-Bohm interferometers},
author = {Luis G. G. V. Dias da Silva and Nancy Sandler and Pascal Simon and Kevin Ingersent and Sergio E. Ulloa},
journal= {arXiv preprint arXiv:0901.2475},
year = {2009}
}
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