Simmonds R W, Marchenkov A, Davis J C, Packard R E
Department of Physics, University of California, Berkeley, California 94720, USA.
Phys Rev Lett. 2001 Jul 16;87(3):035301. doi: 10.1103/PhysRevLett.87.035301. Epub 2001 Jun 26.
We have studied the mass currents through a superfluid 3He Josephson weak link in the presence of an externally applied ac pressure modulation. Characteristic changes in the dc mass currents are observed whenever the superfluid Josephson frequency omega(J) is an integer multiple of the ac modulation frequency omega. The measured dependencies of these current changes on ac pressure amplitude are in excellent agreement with theory describing quantum phase dynamics of superfluid 3He weak links. These results establish the superfluid analog of the superconducting Shapiro effect.
我们研究了在外部施加交流压力调制的情况下，通过超流3He约瑟夫森弱连接的质量电流。每当超流约瑟夫森频率ω(J)是交流调制频率ω的整数倍时，就会观察到直流质量电流的特征变化。这些电流变化对交流压力幅度的测量依赖性与描述超流3He弱连接量子相动力学的理论非常吻合。这些结果确立了超导夏皮罗效应的超流类似物。
