Orbital caloritronic transport in strongly interacting quantum dots

Abstract

We discuss out-of-equilibrium population imbalances between different orbital states due to applied thermal gradients. This purely thermoelectric orbital effect appears quite generically in nanostructures with a pseudospin degree of freedom. We establish an orbital Seebeck coefficient that characterizes the induced orbital bias in response to a temperature difference between reservoirs coupled to a quantum conductor. We analyze a two-terminal strongly interacting quantum dot with two orbital states and find that the orbital thermopower acts as an excellent tool to describe the transition between SU(4) and SU(2) Kondo physics. Our conclusions are reinforced from a detailed comparison with the charge thermopower using numerical renormalization group calculations.

12 pages, 4 figures

References in corpus (11)

• The numerical renormalization group method for quantum impurity systems
• Orbital Kondo effect in carbon nanotubes
• Thermopower of a Kondo-correlated quantum dot
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Thermoelectric transport through strongly correlated quantum dots
• SU(4) and SU(2) Kondo Effects in Carbon Nanotube Quantum Dots
• Quantum phase transition in capacitively coupled double quantum dots
• Kondo Effects in Carbon Nanotubes: From SU(4) to SU(2) symmetry
• Pseudospin-Resolved Transport Spectroscopy of the Kondo Effect in a Double Quantum Dot
• Thermopower of an SU(4) Kondo resonance under an SU(2) symmetry-breaking field
• Minimal realization of the Orbital Kondo effect in a Quantum Dot with two Leads

Cited by in corpus (8)

• Spin-dependent thermoelectric effects in a strongly correlated double quantum dot
• Thermoelectric effects in graphene with local spin-orbit interaction
• Fate of the spin-\frac{1}{2} Kondo effect in the presence of temperature gradients
• Nonlinear Seebeck effect of SU($N$) Kondo impurity
• Spin filtering and thermopower in star coupled quantum dot devices
• Proposal for a local heating driven spin current generator
• SU(4) Kondo entanglement in double quantum dot devices
• Transmission phase evolution in fully screened and overscreened Kondo impurities