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Pseudospin-Resolved Transport Spectroscopy of the Kondo Effect in a Double Quantum Dot

S. Amasha, A. J. Keller, I. G. Rau, A. Carmi, J. A. Katine, Hadas Shtrikman, Y. Oreg, and D. Goldhaber-Gordon
Phys. Rev. Lett. 110, 046604 – Published 24 January 2013
Physics logo See Synopsis: Probing Kondo Physics with a Light Touch
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Abstract

We report measurements of the Kondo effect in a double quantum dot, where the orbital states act as pseudospin states whose degeneracy contributes to Kondo screening. Standard transport spectroscopy as a function of the bias voltage on both dots shows a zero-bias peak in conductance, analogous to that observed for spin Kondo in single dots. Breaking the orbital degeneracy splits the Kondo resonance in the tunneling density of states above and below the Fermi energy of the leads, with the resonances having different pseudospin character. Using pseudospin-resolved spectroscopy, we demonstrate the pseudospin character by observing a Kondo peak at only one sign of the bias voltage. We show that even when the pseudospin states have very different tunnel rates to the leads, a Kondo temperature can be consistently defined for the double quantum dot system.

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  • Received 6 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.046604

© 2013 American Physical Society

Synopsis

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Probing Kondo Physics with a Light Touch

Published 24 January 2013

A new scheme exploiting the orbital rather than the spin degree of freedom allows for studying the Kondo effect without disturbing it.

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Authors & Affiliations

S. Amasha1, A. J. Keller1, I. G. Rau2,*, A. Carmi3, J. A. Katine4, Hadas Shtrikman3, Y. Oreg3, and D. Goldhaber-Gordon1,3,†

  • 1Department of Physics, Stanford University, Stanford, California 94305, USA
  • 2Department of Applied Physics, Stanford University, Stanford, California 94305, USA
  • 3Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 96100, Israel
  • 4HGST, San Jose, California 95135, USA

  • *Present address: IBM Almaden Research Center, San Jose, California 95120, USA.
  • Present address: Stanford University, Stanford, California 94305, USA. goldhaber-gordon@stanford.edu

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Issue

Vol. 110, Iss. 4 — 25 January 2013

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