2-CHANNEL KONDO SCALING IN CONDUCTANCE SIGNALS FROM 2-LEVEL TUNNELING SYSTEMS

被引：156
作者：
RALPH, DC
LUDWIG, AWW
VONDELFT, J
BUHRMAN, RA
机构：
[1] CORNELL UNIV, SCH APPL & ENGN PHYS, ITHACA, NY 14853 USA
[2] PRINCETON UNIV, JOSEPH HENRY LABS PHYS, PRINCETON, NJ 08544 USA
[3] CORNELL UNIV, ATOM & SOLID STATE PHYS LAB, ITHACA, NY 14853 USA
来源：
PHYSICAL REVIEW LETTERS | 1994年 / 72卷 / 07期
关键词：
D O I：
10.1103/PhysRevLett.72.1064
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The temperature (T) and voltage (V) dependence of conductance signals in metal point contacts, previously asserted to be due to 2-channel Kondo scattering from atomic 2-level tunnelling systems, collapse onto a universal scaling curve dependent on eV/k(B)T, for all T and eV/k(B) below a characteristic Kondo scale. Measurements determine a conductance exponent of 1/2, as expected from conformal field theory solution of the 2-channel Kondo model. The magnetic field (H) dependence at low T is nonanalytic at H = 0 (proportional to\H\) in contrast to Fermi-Liquid theory but in agreement with conformal field theory.
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页码：1064 / 1067
页数：4
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