Tunable Pseudogap Kondo Effect and Quantum Phase Transitions in Aharonov-Bohm Interferometers

Luis G. G. V. Dias da Silva, Nancy Sandler, Pascal Simon, Kevin Ingersent, and Sergio E. Ulloa
Phys. Rev. Lett. 102, 166806 – Published 24 April 2009

Abstract

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.

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  • Received 11 January 2009

DOI:https://doi.org/10.1103/PhysRevLett.102.166806

©2009 American Physical Society

Authors & Affiliations

Luis G. G. V. Dias da Silva1,*, Nancy Sandler2, Pascal Simon3,4, Kevin Ingersent5, and Sergio E. Ulloa2

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 2Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979, USA
  • 3Laboratoire de Physique et Modélisation des Milieux Condensés, CNRS et Université Joseph Fourier, 38042 Grenoble, France
  • 4Laboratoire de Physique des Solides, CNRS UMR-8502, Université Paris Sud, 91405 Orsay Cedex, France
  • 5Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, USA

  • *diasdasilval@ornl.gov

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Issue

Vol. 102, Iss. 16 — 24 April 2009

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