Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Transport: Quantum Dots, Quantum Wires, Point Contacts II (organized by TT)

TT 19.7: Vortrag

Montag, 31. März 2014, 17:45–18:00, HSZ 204

Hybrid Microwave Cavity Heat Engine — Christian Bergenfeldt¹, Peter Samuelsson¹, •Björn Sothmann², Christian Flindt², and Markus Büttiker² — ¹Physics Department, Lund University, Box 118, SE-22100 Lund, Sweden — ²Département de Physique Théorique, Université de Genève, CH-1211 Genève 4, Switzerland

We propose and analyze the use of hybrid microwave cavities as quantum heat engines. A possible realization consists of two macroscopically separated quantum dot conductors coupled capacitively to the fundamental mode of a microwave cavity. We demonstrate that an electrical current can be induced in one conductor through cavity-mediated processes by heating up the other conductor. The heat engine can reach Carnot efficiency with optimal conversion of heat to work. When the system delivers the maximum power, the efficiency can be a large fraction of the Carnot efficiency. The heat engine functions even with moderate electronic relaxation and dephasing in the quantum dots. We provide detailed estimates for the electrical current and output power using realistic parameters.
C. Bergenfeldt, P. Samuelsson, B. Sothmann, C. Flindt and M. Büttiker, arXiv:1307.4833v1 (2013).