Thermoelectric Transport through a Quantum Dot: Effects of Kondo Channels Asymmetry

Details Thermoelectric Transport through a Quantum Dot: Effects of Kondo Channels Asymmetry Thermoelectric Transport through a Quantum Dot: Effects of Kondo Channels Asymmetry

2009-12-23

arxiv.org/abs/0912.4632v1

Phys. Rev. B 82, 113306 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 eps figures

Scientific paper

We consider effects of magnetic field on the thermopower and thermoconductance of a single-electron transistor based on a quantum dot strongly coupled to one of the leads by a single-mode quantum point contact. We show appearance of two new energy scales: T_{min} ~ |r|^2 E_C(B/B_C)^2 depending on a ratio of magnetic field B and the field B_C corresponding to a full polarization of point contact and T_{max} ~ |r|^2 E_C depending on a reflection amplitude r and charging energy E_C. We predict that the behavior of thermoelectric coefficients is consistent with the Fermi-liquid theory at temperatures T << T_{min}, while crossover from Non-Fermi-liquid regime associated with a two-channel Kondo effect to Fermi-liquid single-channel Kondo behavior can be seen at T_{min}

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