Thermoelectric Transport through a Quantum Dot Coupled to a Normal Metal and BCS Superconductor

• Authors: M. Krawiec
• Languages of publication: EN

Abstracts

EN

We discuss thermoelectric properties of a quantum dot coupled to one normal and one superconducting lead in the presence of the Kondo effect and the Andreev scattering. We will focus on conductance, thermal conductance, thermopower and related quantities like thermoelectric figure of merit which is a direct measure of the usefulness of the system for applications and the Wiedemann-Franz ratio which indicates if the system is in the Fermi liquid state. We will show that the superconductivity strongly modifies the thermal properties of the system. In particular, the thermopower is strongly enhanced near the superconducting transition temperature. Moreover, the Andreev reflections are suppressed due to strong on-dot Coulomb repulsion. The suppression of the Andreev reflections leads to a violation of the Wiedemann-Franz law and to a non-Fermi liquid ground state.

Keywords

EN

73.63.Kv; 73.23.-b; 73.50.Lw; 72.15.Qm; 74.45.+c

Discipline

• 72.15.Qm: Scattering mechanisms and Kondo effect(see also 75.20.Hr Local moments in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions in magnetic properties and materials)
• 73.50.Lw: Thermoelectric effects
• 74.45.+c: Proximity effects; Andreev reflection; SN and SNS junctions
• 73.23.-b: Electronic transport in mesoscopic systems
• 73.63.Kv: Quantum dots

• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 114
• Issue: 1
• Pages: 115-122

Dates

published

2008-07

received

2007-11-06

Contributors

author

M. Krawiec

• Institute of Physics, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

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Identifiers

DOI

10.12693/APhysPolA.114.115