CONDUCTANCE FLUCTUATIONS IN A BALLISTIC METALLIC POINT CONTACT

被引：68

作者：

HOLWEG, PAM ^{[1
]}

KOKKEDEE, JA ^{[1
]}

CARO, J ^{[1
]}

VERBRUGGEN, AH ^{[1
]}

RADELAAR, S ^{[1
]}

JANSEN, AGM ^{[1
]}

WYDER, P ^{[1
]}

机构：

[1] MAX PLANCK INST FESTKORPERFORSCH,HOCHFELD MAGNETLAB,F-38042 GRENOBLE,FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.67.2549

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetoconductance of a 3D ballistic Ag point contact is found to show reproducible fluctuations with rms amplitude 2 orders of magnitude lower than usually observed in diffusive systems and insensitive to temperature up to T = 5 K. This is explained by quantum interference of electrons, the length scale of the trajectories of interfering waves being the elastic mean free path. For an applied voltage across the constriction, the observed magnetofingerprint changes asymmetrically under bias reversal with a roughly constant rms amplitude. At higher voltages (V greater-than-or-equal-to 10 mV), electron-phonon coupling destroys the phase coherence and a strong decrease in fluctuation amplitude is observed.

引用

页码：2549 / 2552

页数：4

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