Electron-nuclei spin coupling in GaAs-Free versus localized electrons

被引：20

作者：

Huang, J. ^{[1
]}

Chen, Y. S. ^{[1
]}

Ludwig, A. ^{[2
]}

Reuter, D. ^{[2
]}

Wieck, A. D. ^{[2
]}

Bacher, G. ^{[1
]}

机构：

[1] Univ Duisburg Essen, CeNIDE, D-47057 Duisburg, Germany

[2] Ruhr Univ Bochum, Lehrstuhl Angew Festkorperphys, D-44780 Bochum, Germany

来源：

APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 13期

关键词：

MAGNETIC-RESONANCE; DIFFUSION CONSTANT; OPTICAL-DETECTION; NMR; SEMICONDUCTORS; SPINTRONICS; RELAXATION;

D O I：

10.1063/1.3699261

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on an experimental evidence of a significantly different dynamic nuclear polarization (DNP) for localized and itinerant electrons in n-GaAs. Optically injected spin-polarized electrons are used to generate dynamic nuclear polarization via electron-nucleus hyperfine interaction. Using time resolved Kerr rotation measurements for probing the transient Overhauser field, the DNP time constants for itinerant and localized electrons are extracted to be 10 min and less than 1 min, respectively. This is attributed to a rapid DNP occurring in the vicinity of the donors followed by a delayed nuclear spin polarization in between the donor sites. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3699261]

引用

页数：4

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