Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 1
TT 6.6: Vortrag
Montag, 26. März 2012, 10:45–11:00, BH 334
Even-odd effect in the thermopower of superconducting single-electron transistors — •Jens Siewert1,2 and Christopher Eltschka3 — 1Departamento de Química Física, Universidad del País Vasco, 48080 Bilbao, Spain — 2Ikerbasque, Basque Foundation for Science, 48011 Bilbao, Spain — 3Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
We study charge and heat transport in single-electron transistors with
a superconducting island and normal-conducting leads (NSN SET). Below
a crossover temperature T∗ the transport properties of this
device depend on the parity of the island charge number, i.e.,
whether all electrons are paired in Cooper pairs or whether
there is a single unpaired electron [1].
While this effect has been described
for the current-voltage characteristics of NSN SET,
we show that even-odd effects manifest themselves also in the thermopower.
Our results can be understood by applying an idea due to Matveev [2].
A particularly interesting finding is that the thermoelectric efficiency
ZT may grow dramatically (up to 103 for realistic parameters)
for such devices.
[1] M.T. Tuominen, J.M. Hergenrother, T.S. Tighe,
and M. Tinkham,
Phys. Rev. Lett. 69, 1997 (1992).
[2] K.A. Matveev, Statistical and Dynamical Aspects of Mesoscopic Systems.
Proceedings of the XVI Sitges Conference on Statistical Mechanics (2000).