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The Kondo effect in quantum dots at high voltage: Universality and scaling | | A. Rosch
; J. Kroha
; P. Wölfle
; | | Date: |
3 May 2001 | | Journal: | Phys. Rev. Lett. 87, 156802 (2001). | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Strongly Correlated Electrons | cond-mat.mes-hall cond-mat.str-el | | Affiliation: | Institut TKM, Univ. Karlsruhe, Germany | | Abstract: | We examine the properties of a dc-biased quantum dot in the Coulomb blockade regime. For voltages V large compared to the Kondo temperature T_K, the physics is governed by the scales V and gamma, where gamma ~ V/ln^2(V/T_K) is the non-equilibrium decoherence rate induced by the voltage-driven current. Based on scaling arguments, self-consistent perturbation theory and perturbative renormalization group, we argue that due to the large gamma, the system can be described by renormalized perturbation theory for ln(V/T_K) >> 1. However, in certain variants of the Kondo problem, two-channel Kondo physics is induced by a large voltage V. | | Source: | arXiv, cond-mat/0105032 | | Services: | Forum | Review | PDF | Favorites | |
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