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...

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Bibliographic Details
Published in:	Physical review letters Vol. 102; no. 16; p. 166806
Main Authors:	Dias da Silva, Luis G G V, Sandler, Nancy, Simon, Pascal, Ingersent, Kevin, Ulloa, Sergio E
Format:	Journal Article
Language:	English
Published:	United States 24-04-2009
Subjects:	GROUND STATES INTERFEROMETERS KONDO EFFECT MAGNETIC FLUX NANOSCIENCE AND NANOTECHNOLOGY PHASE SHIFT QUANTUM DOTS
Online Access:	Get full text
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 DE-AC05-00OR22725 USDOE Office of Science (SC)
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.102.166806