Nuclear and excitonic spin polarization formed using cross-linearly polarized pulse pair via half-localized state in a single self-assembled quantum dot

被引：1

作者：

Sasakura, H. ^{[1
]}

Adachi, S. ^{[1
,2
]}

Muto, S. ^{[1
,2
]}

Hirose, S. ^{[3
]}

Song, H. Z. ^{[1
,4
]}

Takatsu, M. ^{[1
,4
]}

机构：

[1] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

[2] Hokkaido Univ, Dept Appl Phys, Sapporo, Hokkaido 0608628, Japan

[3] Fujitsu Labs Ltd, Atsugi, Kanagawa 2430197, Japan

[4] Fujitsu Ltd, Atsugi, Kanagawa 2430197, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 10期

关键词：

D O I：

10.1063/1.2927448

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The oscillations of excitonic and nuclear spin polarizations in an optically pumped single self-assembled In0.8Al0.2As/Al0.35Ga0.65As quantum dot (QD) were clearly observed under the excitation of a wetting layer edge at B=5 T. This indicates that an exciton pair with opposite spins is alternatively created via the half-localized state only by changing the delay time between cross-linearly polarized pulse pair. Furthermore, periodic modulation of Zeeman energy synchronizes the degree of circular polarization of photoluminescence from a single QD, indicating that the Overhauser field follows the optically created electron spin polarization in half-localized states of a QD, and the half-localized state in a QD consists of a confined electron in a discrete state and hole in the continuum state. (C) 2008 American Institute of Physics.

引用

页数：5