Marvellous things in marvellous rings: energy spectrum, spins and persistent currents

被引：16

作者：

Ihn, T ^{[1
]}

Fuhrer, A

Heinzel, T

Ensslin, K

Wegscheider, W

Bichler, M

机构：

[1] Swiss Fed Inst Technol, Solid State Phys Lab, CH-8093 Zurich, Switzerland

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

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

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2003年 / 16卷 / 01期

关键词：

quantum dots; Coulomb-blockade; Aharonov-Bohm effect; persistent currents; spin-pairing;

D O I：

10.1016/S1386-9477(02)00592-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Magnetotransport experiments on a semiconductor quantum ring in the Coulomb blockade regime are described. The measurements allow to extract the discrete energy levels of a realistic ring, which are found to agree well with theoretical expectations. The interaction effects important for our ring structure are analysed in detail. The experimentally observed charging energy can be quantitatively understood within the Hartree approximation including a strong screening contribution due to the top gate. The strong screening effect is the reason for the frequent Occurrence of spin-pairs in the addition spectra, The relation of the observed addition spectra to persistent Currents is established and the magnitude of the current is extracted from experimental data. (C) 2002 Published by Elsevier Science B.V.

引用

页码：83 / 89

页数：7

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