Nonequilibrium nuclear-electron spin dynamics in semiconductor quantum dots

被引：29

作者：

Feng, D. H. ^{[1
]}

Akimov, I. A. ^{[1
]}

Henneberger, F. ^{[1
]}

机构：

[1] Humboldt Univ, Inst Phys, Newtonstr 15, D-12489 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 03期

关键词：

OPTICAL-DETECTION; GROWTH; GAAS;

D O I：

10.1103/PhysRevLett.99.036604

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the spin dynamics in charged quantum dots in the situation where the resident electron is coupled to only about 200 nuclear spins and where the electron spin splitting induced by the Overhauser field does not exceed markedly the spectral broadening. The formation of a dynamical nuclear polarization as well as its subsequent decay by the dipole-dipole interaction is directly resolved in time. Because not limited by intrinsic nonlinearities, almost complete nuclear polarization is achieved, even at elevated temperatures. The data suggest a nonequilibrium mode of nuclear polarization, distinctly different from the spin temperature concept exploited on bulk semiconductors.

引用

页数：4

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