標題: Nonequilibrium quantum transport through a dissipative resonant level
作者: Chung, Chung-Hou
Le Hur, Karyn
Finkelstein, Gleb
Vojta, Matthias
Woelfle, Peter
電子物理學系
Department of Electrophysics
公開日期: 21-Jun-2013
摘要: The resonant-level model represents a paradigmatic quantum system which serves as a basis for many other quantum impurity models. We provide a comprehensive analysis of the nonequilibrium transport near a quantum phase transition in a spinless dissipative resonant-level model, extending earlier work [Phys. Rev. Lett 102, 216803 (2009)]. A detailed derivation of a rigorous mapping of our system onto an effective Kondo model is presented. A controlled energy-dependent renormalization-group approach is applied to compute the nonequilibrium current in the presence of a finite bias voltage V. In the linear-response regime V -> 0, the system exhibits as a function of the dissipative strength a localized-delocalized quantum transition of the Kosterlitz-Thouless (KT) type. We address fundamental issues of the nonequilibrium transport near the quantum phase transition: Does the bias voltage play the same role as temperature to smear out the transition? What is the scaling of the nonequilibrium conductance near the transition? At finite temperatures, we show that the conductance follows the equilibrium scaling for V < T, while it obeys a distinct nonequilibrium profile for V > T. We furthermore provide different signatures of the transition in the finite-frequency current noise and ac conductance via a recently developed functional renormalization group (FRG) approach. The generalization of our analysis to nonequilibrium transport through a resonant level coupled to two chiral Luttinger liquid leads, generated by fractional quantum Hall edge states, is discussed. Our work on the dissipative resonant level has direct relevance to experiments on a quantum dot coupled to a resistive environment, such as H. Mebrahtu et al., [Nature (London) 488, 61 (2012)].
URI: http://dx.doi.org/10.1103/PhysRevB.87.245310
http://hdl.handle.net/11536/22284
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.87.245310
期刊: PHYSICAL REVIEW B
Volume: 87
Issue: 24
起始頁: 0
結束頁: 0
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