Nonequilibrium Kondo impurity: Perturbation about an exactly solvable point

Phys. Rev. B 57, 2991 – Published 1 February 1998
Kingshuk Majumdar, Avraham Schiller, and Selman Hershfield

Abstract

We perturb about an exactly solvable point for the nonequilibrium Kondo problem. In each of the three independent directions in parameter space, the differential conductance evolves smoothly as one goes away from the solvable point, and the lowest-order correction contains the logarithm of the band width, or cutoff. Perturbing towards physically realistic exchange couplings yields differential-conductance curves which more closely resemble experimental data than at the solvable point. The leading coefficient which describes the low-temperature and low-voltage scaling changes as one perturbs away from the solvable point, indicating nonuniversal behavior; however, it is restored to the solvable-point value in the limit of an infinite band width.

DOI: http://dx.doi.org/10.1103/PhysRevB.57.2991

  • Received 31 July 1997
  • Revised 14 October 1997
  • Published in the issue dated 1 February 1998

© 1998 The American Physical Society

Authors & Affiliations

Kingshuk Majumdar

  • Department of Physics and National High Magnetic Field Laboratory, University of Florida, 215 Williamson Hall, Gainesville, Florida 32611

Avraham Schiller

  • Department of Physics and National High Magnetic Field Laboratory, University of Florida, 215 Williamson Hall, Gainesville, Florida 32611
  • Department of Physics, The Ohio State University, Columbus, Ohio 43210-1106

Selman Hershfield

  • Department of Physics and National High Magnetic Field Laboratory, University of Florida, 215 Williamson Hall, Gainesville, Florida 32611

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