Quantum confinement suppressing electronic heat flow below the Wiedemann-Franz law

Abstract

The Wiedemann-Franz law states that the charge conductance and the electronic contribution to the heat conductance are proportional. This sets stringent constraints on efficiency bounds for thermoelectric applications, which seek for large charge conduction in response to a small heat flow. We present experiments based on a quantum dot formed inside a semiconducting InAs nanowire transistor, in which the heat conduction can be tuned significantly below the Wiedemann-Franz prediction. Comparison with scattering theory shows that this is caused by quantum confinement and the resulting energy-selective transport properties of the quantum dot. Our results open up perspectives for tailoring independently the heat and electrical conduction properties in semiconductor nanostructures.

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• Violation of the Wiedemann-Franz law in the Topological Kondo model
• Multi-particle scattering and breakdown of the Wiedemann-Franz law at a junction of N interacting quantum wires
• Revealing the fuel of a quantum continuous measurement-based refrigerator
• Thermoelectric cooling of a finite reservoir coupled to a quantum dot
• Rapid optimal work extraction from a quantum-dot information engine
• A Strongly Correlated Quantum-Dot Heat Engine with Optimal Performance: An Non-equilibrium Green's function Approach
• Transport in Single Quantum Dots: A Review from Linear Response to Nonlinear Regimes