Electron thermal conductance in a ballistic nanowire in the presence of Rashba interaction and an in-plane magnetic field

We report on the thermal conductance of electrons in ballistic nanowires at low temperatures. The thermal conductance is calculated using the single-particle formalism taking into account local maxima in the dispersion relation. As the chemical potential increases, the thermal conductance follows the step-like quantization of the electric conductance that is dependent on the direction of the magnetic field. Results indicate that the Wiedemann-Franz law is violated at the jump of the electric conductance at very low temperatures.