Crosser M S, Virtanen Pauli, Heikkilä Tero T, Birge Norman O
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA.
Phys Rev Lett. 2006 Apr 28;96(16):167004. doi: 10.1103/PhysRevLett.96.167004. Epub 2006 Apr 26.
Using tunneling spectroscopy, we have measured the local electron energy distribution function in the normal part of a superconductor-normal metal-superconductor (SNS) Josephson junction containing an extra lead to a normal reservoir. In the presence of simultaneous supercurrent and injected quasiparticle current, the distribution function exhibits a sharp feature at very low energy. The feature is odd in energy and odd under reversal of either the supercurrent or the quasiparticle current direction. The feature represents an effective temperature gradient across the SNS Josephson junction that is controllable by the supercurrent.
利用隧穿光谱技术，我们测量了一个包含通向正常库的额外引线的超导-正常金属-超导（SNS）约瑟夫森结正常部分的局部电子能量分布函数。在同时存在超电流和注入的准粒子电流的情况下，分布函数在非常低的能量处呈现出一个尖锐特征。该特征在能量上是奇函数，并且在超电流或准粒子电流方向反转时也是奇函数。该特征代表了一个跨SNS约瑟夫森结的有效温度梯度，其可由超电流控制。
