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Conductance of a dissipative quantum dot: Nonequilibrium crossover near a non-Fermi-liquid quantum critical point

Zhang, G.; Novais, E.; Baranger, H. U.


We find the nonlinear conductance of a dissipative resonant level in the nonequilibrium steady state near its quantum critical point. The system consists of a spin-polarized quantum dot connected to two resistive leads that provide ohmic dissipation. We focus on the crossover from the strong-coupling, non-Fermi-liquid regime to the weak-coupling, Fermi-liquid ground state, a crossover driven by the instability of the quantum critical point to hybridization asymmetry or detuning of the level in the dot. We show that the crossover properties are given by tunneling through an effective single barrier described by the boundary sine-Gordon model. The nonlinear conductance is then obtained from thermodynamic Bethe ansatz results in the literature, which were developed to treat tunneling in a Luttinger liquid. The current-voltage characteristics are thus found for any value of the resistance of the leads. For the special case of lead resistance equal to the quantum resistance, we find mappings onto, first, the two-channel Kondo model and, second, an effectively noninteracting model from which the nonlinear conductance is found analytically. ... mehr

DOI: 10.1103/PhysRevB.104.165423
Zitationen: 1
Web of Science
Zitationen: 1
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0163-1829, 0556-2805, 1095-3795, 1098-0121, 1538-4489, 1550-235X, 2469-9950, 2469-9969, 2469-9977
KITopen-ID: 1000140700
HGF-Programm 47.12.01 (POF IV, LK 01) Advanced Solid-State Qubits and Qubit Systems
Erschienen in Physical review / B
Verlag American Physical Society (APS)
Band 104
Heft 16
Seiten Art.Nr. 165423
Vorab online veröffentlicht am 25.10.2021
Nachgewiesen in Dimensions
Web of Science
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