期刊
PHYSICAL REVIEW B
卷 81, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.075216
关键词
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资金
- German Science Foundation (DFG)
- Federal Ministry for Education and Research (BMBF NanoQuit)
- Centre for Quantum Engineering and Space-Time Research in Hannover (QUEST)
- Evangelisches Studienwerk
We have measured the electron-spin-relaxation rate and the integrated spin noise power in n-doped GaAs for temperatures between 4 and 80 K and for doping concentrations ranging from 2.7 x 10(15) to 8.8 x 10(16) cm(-3) using spin noise spectroscopy. The temperature-dependent measurements show a clear transition from localized to free electrons for the lower doped samples and confirm mainly free electrons at all temperatures for the highest doped sample. While the sample at the metal-to-insulator transition shows the longest spin-relaxation time at low temperatures, a clear crossing of the spin-relaxation rates is observed at 70 K and the highest doped sample reveals the longest spin-relaxation time above 70 K.
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