VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013

 QNplage

 Nanophysics: from fundamentals to applications

(the return)

 

Wednesday 7
Hybrid's

› 16:30 - 16:50 (20min)
Experimental test of quantum reciprocity relations in thermoelectric transport
Francesca Battista  1, 2, *@  , Jason Matthews  3@  , Peter Samuelsson  1@  , David Sánchez  4@  , Heiner Linke  5@  
1 : Mathematical Physics and nanometer Structure Consortium (nmC@LU)
Lund University, Box 118, S-22100, Lund -  Sweden
2 : Institute for Theory of Statistical Physics RWTH Aachen
Physikzentrum D - 52074 Aachen -  Germany
3 : Physics Department and Materials Science Institute, University of Oregon
University of Oregon, Eugene, Oregon 97403-1274 -  United States
4 : Instituto de Física Interdisciplinar y Sistemas Complejos  (IFISC (CSIC-UIB))
Campus Universitat de les Illes Balears, E-07122 Palma de Mallorca -  Spain
5 : Solid State Physics and Nanometer Structure Consortium (nmC@LU)
Lund University, Box 118, S-22100 Lund -  Sweden
* : Corresponding author

Symmetry relations are manifestations of fundamental principles. An example are Onsager's relations, which derive from the principle of microreversibility. Additional reciprocity relations have been predicted to exist uniquely[1] for the case of coupled thermal[2] and electric transport and they can be destroyed by processes suppressing quantum coherence, such as[3,4] inelastic scattering. Here we present an experimental verification of quantum thermoelectric reciprocity relations in a four-terminal mesoscopic device where each terminal can be electrically and thermally biased, individually. The linear response thermoelectric coefficients are found to be symmetric under simultaneous reversal of magnetic field and exchange of injection and emission contacts. We also observe the breakdown of the reciprocity relations as a function of increasing thermal bias, raising new questions about the relative roles of non-linear and inelastic effects. The results provide compelling evidence for the fundamental nature of the thermoelectric reciprocity relations.

[1] P. Jacquod, et al., Phys. Rev. B 86, 155118 (2012).

[2] P. N. Butcher, J. Phys.: Condens. Matter 2, 4869 (1990).

[3,4] K. Saito, et al. Phys. Rev. B 84, 201306(R) (2011); D. Sánchez and M. Büttiker, Phys. Rev. Lett. 93, 106802 (2004).



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