%0 Journal Article
%T Correlations of heat and charge currents in quantum-dot thermoelectric engines
%A Rafael S¨¢nchez
%A Bj£¿rn Sothmann
%A Andrew N. Jordan
%A Markus B¨¹ttiker
%J Physics
%D 2013
%I arXiv
%R 10.1088/1367-2630/15/12/125001
%X We analyze the noise properties of both electric charge and heat currents as well as their correlations in a quantum-dot based thermoelectric engine. The engine is a three-terminal conductor with crossed heat and charge flows where heat fluctuations can be monitored by a charge detector. We investigate the mutual influence of charge and heat dynamics and how it is manifested in the current and noise properties. In the presence of energy-dependent tunneling, operating conditions are discussed where a charge current can be generated by heat conversion. In addition, heat can be pumped into the hot source by driving a charge current in the coupled conductor. An optimal configuration is found for structures in which the energy dependence of tunneling maximizes asymmetric transmission with maximal charge-heat cross-correlations. Remarkably, at a voltage that stalls the heat engine we find that in the optimal case the non-equilibrium state is maintained by fluctuations in the heat and charge current only.
%U http://arxiv.org/abs/1307.0598v2