Correlations between charge and heat currents in an interacting quantum dot

International Conference on Strongly Correlated Electron Systems 2014

Crépieux, Adeline^1 ; Eyméoud, Paul^1 ; Michelini, Fabienne^2

Aix Marseille Université, Université de Toulon, CNRS, Marseille

13288, France^1

Aix Marseille Université, CNRS, IM2NP, Marseille

13288, France^2

关键词: Applied voltages;    Cross correlators;    Heat currents;    Non linear;    Occupation numbers;    Voltage dependencies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012140/pdf
DOI  :  10.1088/1742-6596/592/1/012140

来源: IOP

【 摘 要 】

We consider an interacting quantum dot connected to two reservoirs driven at distinct voltage/temperature and we study the correlations between charge and heat currents first as a function of the applied voltage bias, and second as a function of the temperature gradient between the two reservoirs. The Coulomb interactions in the quantum dot are treated using the Hartree approximation and the dot occupation number is determined self-consistently. The correlators exhibit structures in their voltage dependency which are highly non-linear when the coupling between the dot and the reservoirs is weak, and their behavior with temperature is non-monotonous. Moreover the sign of heat cross-correlator can change contrary to what happens with the charge cross-correlator which is always negative. The presence of Coulomb interactions enlarges the domain of voltage in which the heat cross-correlator is negative.