Coulomb blockade and electron spin in quantum dots

被引：0

作者：

Marcus, CM ^{[1
]}

Folk, JA ^{[1
]}

Potok, RM ^{[1
]}

Johnson, AC ^{[1
]}

Kouwenhoven, LP ^{[1
]}

Berkovits, R ^{[1
]}

Kurland, IL ^{[1
]}

Aleiner, IL ^{[1
]}

Altshuler, BL ^{[1
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

来源：

ELECTRONIC CORRELATIONS: FROM MESO- TO NANO-PHYSICS | 2001年

关键词：

D O I：

暂无

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We investigate theoretically and experimentally the behavior of Coulomb blockade peaks in a magnetic field that couples principally to the ground-state spin (rather than the orbital moment) of a quantum dot. In the first part, we discuss numerically observed features in the magnetic field dependence of CB peak spacings that identify changes in spin of each ground state for successive numbers of electrons on the dot. We next evaluate the probability that the ground state of the dot has a particular spin as a function of the exchange strength and (Zeeman-only) magnetic field. We then describe experiments on gate-defined GaAs quantum dots in which Coulomb blockade peak positions and spacings are measured as a function of in-plane magnetic field, allowing changes in spin to be measured. Finally, we present recent experimental results on phase coherent transport through quantum dots embedded in the two arms of an Ahaxonov-Bohm ring, in the presence of large in-plane magnetic fields.

引用

页码：391 / 404

页数：14

共 34 条

[1]

ALEINER IL, 2001, CONDMAT0107385

[2] Itinerant ferromagnetism in disordered metals: A mean-field theory [J].