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

Abstract

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}<T<T_{max}.

4 pages, 3 eps figures

References in corpus (5)

• Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4
• Observation of the two-channel Kondo effect
• Thermopower of a Kondo-correlated quantum dot
• Thermo-Electric Properties of Quantum Point Contacts
• Sequential and co-tunneling behavior in the temperature-dependent thermopower of few-electron quantum dots

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• Strongly-Correlated Thermoelectric Transport beyond Linear Response
• Generalized Wiedemann-Franz law in a two-site charge Kondo circuit: Lorenz ratio as a manifestation of the orthogonality catastrophe
• Coulomb blockade oscillations of heat conductance in the charge Kondo regime
• Spin thermopower in the overscreened Kondo model
• Thermoelectrics of a two-channel charge Kondo circuit: Role of electron-electron interactions in a quantum point contact
• Charge Kondo circuit as a detector for electron-electron interactions in a Luttinger Liquid
• Thermoelectric transport across a tunnel contact between two charge Kondo circuits: beyond perturbation theory
• Nonlinear thermoelectric response of quantum dots: renormalized dual fermions out of equilibrium
• Thermopower signatures and spectroscopy of the canyon of conductance suppression
• Heat conductance oscillations in two weakly connected charge Kondo circuits
• Universal relations between thermoelectrics and noise in mesoscopic transport across a tunnel junction