SU(4) Fermi Liquid State and Spin Filtering in a Double Quantum Dot System

László Borda, Gergely Zaránd, Walter Hofstetter, B. I. Halperin, and Jan von Delft
Phys. Rev. Lett. 90, 026602 – Published 17 January 2003

Abstract

We study a symmetrical double quantum dot (DD) system with strong capacitive interdot coupling using renormalization group methods. The dots are attached to separate leads, and there can be a weak tunneling between them. In the regime where there is a single electron on the DD the low-energy behavior is characterized by an SU(4)-symmetric Fermi liquid theory with entangled spin and charge Kondo correlations and a phase shift π/4. Application of an external magnetic field gives rise to a large magnetoconductance and a crossover to a purely charge Kondo state in the charge sector with SU(2) symmetry. In a four-lead setup we find perfectly spin-polarized transmission.

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  • Received 28 June 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.026602

©2003 American Physical Society

Authors & Affiliations

László Borda1,3, Gergely Zaránd2,3, Walter Hofstetter2, B. I. Halperin2, and Jan von Delft1

  • 1Sektion Physik and Center for Nanoscience, LMU München, Theresienstrasse 37, 80333 München, Germany
  • 2Lyman Physics Laboratory, Harvard University, Cambridge, Massachusetts
  • 3Research Group of the Hungarian Academy of Sciences, Institute of Physics, TU Budapest, H-1521, Hungary

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Vol. 90, Iss. 2 — 17 January 2003

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