Nuclear Spin relaxation mediated by Fermi-edge electrons in n-type GaAs

Autor:	B. R. Namozov, V. L. Korenev, R. I. Dzhioev, Yu. G. Kusrayev, M. Kotur, P. E. Pak, K. V. Kavokin
Rok vydání:	2014
Předmět:	Physics Physics and Astronomy (miscellaneous) Condensed matter physics Solid-state physics Scattering Relaxation (NMR) Spin–lattice relaxation Electron Hyperfine structure Excitation Magnetic field
Zdroj:	JETP Letters. 99:37-41
ISSN:	1090-6487 0021-3640
DOI:	10.1134/s0021364014010068
Popis:	A method based on the optical orientation technique was developed to measure the nuclear-spin lattice relaxation time T 1 in semiconductors. It was applied to bulk n-type GaAs, where T 1 was measured after switching off the optical excitation in magnetic fields from 400 to 1200 G at low (< 30 K) temperatures. The spin-lattice relaxation of nuclei in the studied sample with n D = 9 × 1016 cm−3 was found to be determined by hyperfine scattering of itinerant electrons (Korringa mechanism) which predicts invariability of T 1 with the change in magnetic field and linear dependence of the relaxation rate on temperature. This result extends the experimentally verified applicability of the Korringa relaxation law in degenerate semiconductors, previously studied in strong magnetic fields (several Tesla), to the moderate field range.
Databáze:	OpenAIRE
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