Spin-Charge Separation and the Kondo Effect in an Open Quantum Dot

L. I. Glazman; F. W. J. Hekking; A. I. Larkin

doi:10.1103/PhysRevLett.83.1830

Spin-Charge Separation and the Kondo Effect in an Open Quantum Dot

L. I. Glazman, F. W. J. Hekking, and A. I. Larkin

Phys. Rev. Lett. 83, 1830 – Published 30 August 1999

Abstract

We study the Kondo effect in a quantum dot connected to leads by single-mode junctions at almost perfect conductance. In this new regime, the Kondo effect develops at a temperature $T_{K}$ that is sufficiently high for experiments. Unlike in the conventional case of small-conductance junctions, $G ≪ e^{2} / h$ , in the new regime the charge discreteness of the dot is completely lost, while its spin at $T ≳ T_{K}$ remains quantized at $s = 1 / 2$ (spin-charge separation). We find the temperature and gate-voltage dependence of the conductance through the dot in the conditions of spin-charge separation.

Received 12 March 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.1830

Authors & Affiliations

L. I. Glazman¹, F. W. J. Hekking², and A. I. Larkin^1,3

¹Theoretical Physics Institute, University of Minnesota, Minneapolis, Minnesota 55455
²Theoretische Physik III, Ruhr-Universität Bochum, 44780 Bochum, Germany
³L.D. Landau Institute for Theoretical Physics, 117940 Moscow, Russia