Two-channel versus infinite-channel Kondo models for the single-electron transistor

Gergely Zaránd, Gergely Zaránd, Gergely T. Zimányi, Frank Wilhelm

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We investigate the low-temperature dynamics of single electron boxes and transistors close to their degeneracy point using renormalization-group methods. We show that intermode scattering is a relevant perturbation and always drives the system to the two-channel Kondo fixed point, where the two channels correspond to the real spins of the conduction electrons. However, the crossover temperature T*, below which Matveev's two-channel. Kondo scenario [K.A. Matveev, Phys. Rev. B 51. 1743. (1995)] develops decreases extponentially with the number of conduction modes in the tunneling junctions and is extremely small in most cases. Above T* the "infinite channel model" of G. Falci. G Schön, and G.T. Zimany, Phys. Rev. Lett. 74, 3257 (1995) turns out to be a rather good approximation. We discuss the experimental limitations and suggest an experimental setup to observe the multichannel Kondo behavior.

Original languageEnglish
Pages (from-to)8137-8143
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number12
DOIs
Publication statusPublished - Sep 15 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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