Shot noise in charge and magnetization currents of a quantum ring

被引：4
作者：
Cavaliere, F
Haupt, F
Fazio, R
Sassetti, M
机构：
[1] Univ Hamburg, Inst Theoret Phys 1, D-20355 Hamburg, Germany
[2] INFM, LAMIA, I-16146 Genoa, Italy
[3] Dipartimento Fis, I-16146 Genoa, Italy
[4] INFM, NEST, I-56126 Pisa, Italy
[5] Scuola Normale Super Pisa, I-56126 Pisa, Italy
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 23期
关键词：
D O I：
10.1103/PhysRevB.71.235325
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The shot noise in a quantum ring, connected to leads, is studied in the presence of electron interactions in the sequential tunneling regime. Two qualitatively different noise correlations with distinctly different behaviors are identified and studied in a large range of parameters. Noise in the total current is due to the discreteness of the electron charge and can become super-Poissonian as a result of electron interaction. The noise in the magnetization current is comparatively insensitive to the interaction but can be greatly enhanced if an inversion of the populating ratio of the angular states is assumed. The characteristic time scales are studied by a Monte Carlo simulation.
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