Tirelli S, Savin A M, Garcia C Pascual, Pekola J P, Beltram F, Giazotto F
NEST CNR-INFM and Scuola Normale Superiore, I-56126 Pisa, Italy.
Phys Rev Lett. 2008 Aug 15;101(7):077004. doi: 10.1103/PhysRevLett.101.077004. Epub 2008 Aug 14.
We demonstrate experimentally the manipulation of supercurrent in Al-AlOx-Ti Josephson tunnel junctions by injecting quasiparticles in a Ti island from two additional tunnel-coupled Al superconducting reservoirs. Both supercurrent enhancement and quenching with respect to equilibrium are achieved. We demonstrate cooling of the Ti line by quasiparticle injection from the normal state deep into the superconducting phase. A model based on heat transport and the nonmonotonic current-voltage characteristic of a Josephson junction satisfactorily accounts for our findings.
我们通过从另外两个隧道耦合的铝超导库向钛岛注入准粒子，在实验中展示了对铝 - 氧化铝 - 钛约瑟夫森隧道结中超电流的操控。实现了相对于平衡态的超电流增强和猝灭。我们展示了通过从正常态向超导相深处注入准粒子来冷却钛线。一个基于热传输和约瑟夫森结非单调电流 - 电压特性的模型令人满意地解释了我们的发现。
