Kondo effect in a few-electron quantum ring -: art. no. 196601

被引：137

作者：

Keyser, UF

Fühner, C

Borck, S

Haug, RJ

Bichler, M

Abstreiter, G

Wegscheider, W

机构：

[1] Leibniz Univ Hannover, Inst Festkorperphys, D-30167 Hannover, Germany

[2] Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany

[3] Univ Regensburg, D-93040 Regensburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.90.196601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A small quantum ring with less than ten electrons was studied by transport spectroscopy. For strong coupling to the leads a Kondo effect is observed and used to characterize the spin structure of the system in a wide range of magnetic fields. At small magnetic fields Aharonov-Bohm oscillations influenced by Coulomb interaction appear. They exhibit phase jumps by pi at the Coulomb-blockade resonances. Inside Coulomb-blockade valleys the Aharonov-Bohm oscillations can also be studied due to the finite conductance caused by the Kondo effect. Astonishingly, the maxima of the oscillations show linear shifts with increasing magnetic field and gate voltage.

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