Deblock R, Noat Y, Bouchiat H, Reulet B, Mailly D
Laboratoire de Physique des Solides, Associe au CNRS, Batiment 510, Universite Paris-Sud, 91405, Orsay, France.
Phys Rev Lett. 2000 Jun 5;84(23):5379-82. doi: 10.1103/PhysRevLett.84.5379.
In order to investigate the effect of electronic phase coherence on screening we have measured the flux-dependent polarizability of isolated mesoscopic rings at 350 MHz. At low temperatures (below 100 mK) both the nondissipative and the dissipative parts of the polarizability exhibit flux oscillations with a period of one-half a flux quantum in a ring. The sign and amplitude of the effect are in good agreement with recent theoretical predictions. The observed positive magnetopolarizability corresponds to an enhancement of screening when time reversal symmetry is broken. The effect of electronic density and temperature are also measured.
为了研究电子相位相干对屏蔽的影响，我们在350兆赫下测量了孤立介观环的磁通相关极化率。在低温（低于100毫开尔文）下，极化率的非耗散部分和耗散部分在环中均呈现出周期为半个磁通量子的磁通振荡。该效应的符号和幅度与最近的理论预测高度吻合。观测到的正磁极化率对应于时间反演对称性被打破时屏蔽作用的增强。我们还测量了电子密度和温度的影响。
