Phase modulated thermal conductance of Josephson weak links -: art. no. 077003

被引:55
作者
Zhao, E [1 ]
Löfwander, T [1 ]
Sauls, JA [1 ]
机构
[1] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevLett.91.077003
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present a theory for quasiparticle heat transport through superconducting weak links. The thermal conductance depends on the phase difference (phi) of the superconducting leads. Branch-conversion processes, low-energy Andreev bound states near the contact, and the suppression of the local density of states near the gap edge are related to phase-sensitive transport processes. Theoretical results for the influence of junction transparency, temperature, and disorder, on the conductance, are reported. For high-transmission weak links, D-->1, the formation of an Andreev bound state leads to suppression of the density of states for the continuum excitations, and thus, to a reduction in the conductance for phisimilar or equal topi. For low-transmission (Dmuch less than1) barriers resonant scattering leads to an increase in the thermal conductance as T drops below T-c (for phase differences near phi=pi).
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页数:4
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