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Nonlinear thermoelectricity with electron-hole symmetric systems
Physical Review Letters ( IF 8.1 ) Pub Date : 
G. Marchegiani, A. Braggio, and F. Giazotto

In the linear regime, thermo-electric effects between two conductors are possible only in the presence of an explicit breaking of the electron-hole symmetry. We consider a tunnel junction between two electrodes and show that this condition is no longer required outside the linear regime. In particular, we demonstrate that a thermally-biased junction can display an absolute negative conductance (ANC), and hence thermo-electric power, at a small but finite voltage bias, provided that the density of states of one of the electrodes is gapped and the other is monotonically decreasing. We consider a prototype system that fulfills these requirements, namely a tunnel junction between two different superconductors where the Josephson contribution is suppressed. We discuss this nonlinear thermo-electric effect based on the spontaneous breaking of electron-hole symmetry in the system, characterize its main figures of merit and discuss some possible applications.

中文翻译:

电子-空穴对称系统的非线性热电

在线性状态下,只有在明显破坏电子-空穴对称性的情况下,两个导体之间的热电效应才可能发生。我们考虑了两个电极之间的隧道结,并表明在线性范围之外不再需要这种情况。特别地,我们证明了热偏置结可以显示出绝对的负电导(ANC),因此,只要电极之一的状态密度处于间隙且另一个在单调下降。我们考虑一个满足这些要求的原型系统,即两个不同超导体之间的隧道结,从而抑制了约瑟夫森的贡献。
更新日期:2020-02-14
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