Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 73: Fluctuations and Noise
TT 73.3: Vortrag
Freitag, 15. März 2013, 12:15–12:30, H20
Detection of single-electron heat transfer statistics — •Rafael Sánchez1 and Markus Büttiker2 — 1Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Madrid, Spain — 2Université de Genève, Genève, Switzerland
Capacitively coupled conductors permit separate directions of the heat and current flux. Energy is transferred between two conductors by means of electron-electron interaction. When one of systems is at a higher temperature, the transferred heat can be converted to electrical power. In quantum dot systems, the energy transfer is discrete, allowing for high conversion efficiencies[1]. Charge fluctuations of such a system can be monitored by quantum point contact. It allows us to extract the transferred heat statistics from the detection of state-resolved charge fluctuations. We investigate gate dependent deviations away from a charge fluctuation theorem in the presence of local temperature gradients (hot spots). Non universal relations are found for state dependent charge counting. A fluctuation theorem holds for coupled dot configurations with heat exchange and no net particle flow[2].
[1] R. Sánchez, and M. Büttiker, Phys. Rev. B 83, 085428 (2011)
R. Sánchez, and M. Büttiker, Europhys. Lett. (in press); arXiv:1207.2587