Two-channel Kondo effect and the low-temperature crossover

ORAL

Abstract

The two-channel Kondo (2CK) state, where a spin-1/2 impurity is equally exchange-coupled to two independent reservoirs, is a canonical non-Fermi liquid state. Experimental observations are rare because of its sensitivity to common and hard-to-control perturbations. We implement experimentally a 2CK state in a coupled dot-grain system (Potok, et al., doi:10.1038/nature05556), and explore the physics of the low-temperature crossover: how magnetic field and gate voltage drive the system towards a Fermi liquid ground state. Our experimental findings are corroborated by detailed numerical renormalization group modeling of our device.

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Authors

  • Andrew Keller

    Stanford University

  • Lucas Peeters

    Stanford University

  • Ireneusz Weymann

    Adam Mickiewicz University

  • C\u{a}t\u{a}lin Pa\c{s}cu Moca

    Budapest University of Technology and Economics, University of Oradea

  • Diana Mahalu

    Weizmann Institute of Science

  • Vladimir Umansky

    Weizmann Institute of Science

  • Gergely Zar\'and

    Budapest University of Technology and Economics

  • David Goldhaber-Gordon

    Stanford University, Stanford Univ, Department of Physics, Stanford University, Stanford, CA, 94305, USA