Quantum thermoelectric and heat transport in the overscreened Kondo regime: Exact conformal field theory results

Abstract

We develop a conformal-field theory approach for investigation of the quantum charge-, heat- and thermoelectric- transport through a quantum impurity fine tuned to a non-Fermi liquid regime. The non-Fermi-liquid operational mode is associated with the overscreened spin Kondo effect and controlled by the number of orbital channels. The universal low-temperature scaling and critical exponents for Seebeck and Peltier coefficients are investigated for the multichannel geometry. We derive and analyze the universal dependence of the thermoelectric coefficients on the number of orbital channels. We discuss the universality of Lorenz ratio and power factor beyond the Fermi Liquid paradigm. Different methods of verifying our findings based on the recent experiments are proposed.

6 pages with a figure: published version (PRB Rapid communication)

References in corpus (11)

• Observation of the two-channel Kondo effect
• Quantum limit of heat flow across a single electronic channel
• Thermopower of a Kondo-correlated quantum dot
• Thermoelectric transport through strongly correlated quantum dots
• Topological Kondo effect with Majorana fermions
• Quantum phase transition in a two-channel-Kondo quantum dot device
• Universal low-temperature crossover in two-channel Kondo models
• Anyons in Multichannel Kondo Systems
• Impurity entanglement entropy in Kondo systems from conformal field theory
• Dynamical conductance in the two-channel Kondo regime of a double dot system
• The thermal conductance of a two-channel Kondo model

Cited by in corpus (10)

• Violation of the Wiedemann-Franz law in the Topological Kondo model
• SO(5) non-Fermi liquid in a Coulomb box device
• Multi-particle scattering and breakdown of the Wiedemann-Franz law at a junction of N interacting quantum wires
• 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
• Quantum thermal transport in the charged Sachdev-Ye-Kitaev model: Thermoelectric Coulomb blockade
• Transmission phase evolution in fully screened and overscreened Kondo impurities
• Overscreened Kondo problem with large spin and large number of orbital channels: Two distinct semiclassical limits in quantum transport observables
• Noise signatures of a charged Sachdev-Ye-Kitaev dot in mesoscopic transport
• Open harmonic chain without secular approximation