We study the nonequilibrium properties of an electronic circuit composed of a double quantum dot (DQD) channel coupled to a quantum point contact (QPC) within the framework of stochastic thermodynamics. We show that the transition rates describing the dynamics satisfy a nontrivial local detailed balance (LDB) and that the statistics of energy and particle currents across both channels obeys a fluctuation theorem (FT). We analyze two regimes where the device operates as a thermodynamic machine and study its output power and efficiency fluctuations. We show that the electrons tunneling through the QPC without interacting with the DQD have a strong effect on the device efficiency.
@article{arxiv.1506.04769,
title = {Double quantum dot coupled to a quantum point contact: A stochastic thermodynamics approach},
author = {Gregory Bulnes Cuetara and Massimiliano Esposito},
journal= {arXiv preprint arXiv:1506.04769},
year = {2015}
}