Published in
American Physical Society, Physical Review Letters, 18(86), p. 4088-4091, 2001
DOI: 10.1103/physrevlett.86.4088
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Is the Quantum Dot at Large Bias a Weak-Coupling Problem?
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Abstract
We examine the two-lead Kondo model for a d.c. biased quantum dot in the Coulomb blockade regime. From perturbative calculations of the magnetic susceptibility, we show that the problem retains its strong-coupling nature, even at bias voltages larger than the equilibrium Kondo temperature. We give a speculative discussion of the nature of the renormalization group flows and the strong-coupling state that emerges at large voltage bias. For over a decade, transport measurements on quantum dot systems have stimulated theoretical interest in the properties of the Anderson model out of equilibrium [1, 2, 3]. Early predictions [4, 5, 6, 7, 8] of the Kondo effect in such systems have recently been experimentally verified [9, 10, 11]. In the small voltage regime, such experiments have produced impressive agreement with theoretical predictions. Recent interest [12, 13, 14] has turned to the question of how the Kondo effect behaves far from equilibrium, i.e. at large voltage bias.