Detailed measurements of nuclear spin polarizations in a single InAlAs quantum dot through overhauser shift of photoluminescence

被引：2
|
作者：
Kaji, R.
Adachi, S.
Sasakura, H.
Muto, S.
Kumano, H.
Suemune, I.
机构：
[1] Hokkaido Univ, Dept Appl Phys, Kita Ku, Sapporo, Hokkaido 0608628, Japan
[2] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan
[3] Hokkaido Univ, Res Inst Elect Sci, Sapporo, Hokkaido 0010021, Japan
来源：
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2007年 / 20卷 / 06期
基金：
日本科学技术振兴机构;
关键词：
Zeeman splitting; exciton; quantum dots; hyperfine interaction;
D O I：
10.1007/s10948-007-0240-9
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigated optical pumping of nuclear spin polarizations in a single self-assembled In0.75Al0.25As/Al0.3Ga0.7As quantum dot. The nuclear spin polarization exhibits the abrupt jump and hysteresis in the excitation power dependence at a particular excitation polarization. Measurement of circular polarization rate of the photoluminescence reveals that the abrupt change of the nuclear spin polarization is created mainly by the spin flip-flop process between nuclei and an electron of a positive charged exciton in this single quantum dot. Model calculation explains well the experimentally observed bistable behavior in InAlAs quantum dot. By using this abrupt change, the sign and magnitude of electron and hole g-factors in z-direction are verified.
引用
收藏
页码：447 / 451
页数：5
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