Nuclear spin depolarization via slow spin diffusion in single InAlAs quantum dots observed by using erase-pump-probe technique

被引：6

作者：

Adachi, S. ^{[1
]}

Kaji, R. ^{[1
]}

Furukawa, S. ^{[1
]}

Yokoyama, Y. ^{[1
]}

Muto, S. ^{[1
]}

机构：

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

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 10期

关键词：

ELECTRON; PHOTON; SHIFT; GAAS;

D O I：

10.1063/1.4721902

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Nuclear spin diffusion in single self-assembled InAlAs quantum dots was studied by using erase-pump-probe technique. As a measure of nuclear spin polarization, transients of the Overhauser shift (OHS) of positive trion were probed in the respective pulse region. The achieved stable OHS was relaxed with a long depolarization time as long as a few tens of seconds and a diffusion constant of similar to 5 x 10(-15) cm(2)/s was estimated. The slow transfer of the spin energy is considered to be due to the dipole-dipole interaction of the nuclei. In addition, through the magnetic field dependence of OHS, the stability of the nuclear spin polarization was briefly discussed, and the saturated maximum values of OHS were investigated experimentally. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4721902]

引用

页数：6

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