Jariwala E M, Mohanty P, Ketchen M B, Webb R A
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park 20742, USA.
Phys Rev Lett. 2001 Feb 19;86(8):1594-7. doi: 10.1103/PhysRevLett.86.1594.
We have measured a diamagnetic persistent current with flux periodicities of both h/e and h/2e in an array of thirty diffusive mesoscopic gold rings. At the lowest temperatures, the magnitudes of the currents per ring corresponding to the h/e- and h/2e-periodic responses are both comparable to the Thouless energy E(c) identical with Planck's over 2pi/tau(D), where tau(D) is the diffusion time. Taken in conjunction with earlier experiments, our results strongly challenge the conventional theories of persistent current. We consider a new approach associated with the saturation of the phase coherence time tau(phi).
我们在由三十个扩散型介观金环组成的阵列中测量到了具有h/e和h/2e磁通周期性的抗磁持续电流。在最低温度下，对应于h/e和h/2e周期响应的每个环的电流大小都与 Thouless 能量E(c)相当，E(c)等于普朗克常数除以2πτ(D)，其中τ(D)是扩散时间。结合早期实验，我们的结果强烈挑战了传统的持续电流理论。我们考虑了一种与相位相干时间τ(phi)饱和相关的新方法。
