Tunable pseudogap Kondo effect and quantum phase transitions in Aharonov-Bohm interferometers.
We study two quantum dots embedded in the arms of an Aharonov-Bohm ring threaded by a magnetic flux. This 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.
Dias da Silva
Luis G G V
LG
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. diasdasilval@ornl.gov
Sandler
Nancy
N
Simon
Pascal
P
Ingersent
Kevin
K
Ulloa
Sergio E
SE