科研之友
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摘要
Employing quasiclassical theory of superconductivity combined with Keldysh technique we investigate large thermoelectric effect in multiterminal ballistic normal-superconducting hybrid structures. We argue that this effect is caused by electron-hole asymmetry generated by coherent Andreev reflection of quasiparticles at interfaces of two different superconductors with nonzero phase difference. Within our model we derive a general expression for thermoelectric voltages V-T1,V-2 induced in two different normal terminals exposed to a thermal gradient. Our results apply at any temperature difference in the subgap regime and allow us to explicitly analyze both temperature and phase dependencies of V-T1,V-2, demonstrating that in general there exists no fundamental relation between these voltages and the equilibrium Josephson current in superconducting-normal-superconducting junction.
- 出版日期2017-1-31
