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Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 24: Thermoelectricity

HL 24.11: Talk

Tuesday, March 17, 2015, 12:15–12:30, EW 202

Quantum Nernst engines — •Björn Sothmann1, Rafael Sánchez2, and Andrew N. Jordan31Département de Physique Théorique, Université de Genève, Genève, Switzerland — 2Instituto de Ciencia de Materiales de Madrid, CSIC, 28049, Madrid, Spain — 3Department of Physics and Astronomy, University of Rochester, Rochester, USA

Recently, there has been a growing interest in quantum heat engines with broken time-reversal symmetry as such systems in principle allow for increased efficiencies [1]. Here, as a concrete example of such a setup, we consider a quantum Nernst engines based on edge states in the quantum Hall regime [2]. We identify a geometry that exhibits an extreme asymmetry between the off-diagonal Onsager coefficients for heat and charge transports. In terms of thermodynamic efficiency, this engine outperforms a recently proposed classical Nernst engine [3]. A second setup using an antidot is found to be more efficient as energy filtering becomes less strong; a behaviour in stark contrast to other heat engines.

[1] K. Brandner, U. Seifert, New J. Phys. 15, 105003 (2013).

[1] B. Sothmann, R. Sánchez, A. N. Jordan, EPL 107, 47003 (2014).

[2] J. Stark, K. Brandner, K. Saito, U. Seifert, Phys. Rev. Lett. 112, 140601 (2014).

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