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Titolo:
Ferromagnetic imprinting of nuclear spins in semiconductors
Autore:
Kawakami, RK; Kato, Y; Hanson, M; Malajovich, I; Stephens, JM; Johnston-Halperin, E; Salis, G; Gossard, AC; Awschalom, DD;
Indirizzi:
Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA Univ Calif Santa Barbara Santa Barbara CA USA 93106 Barbara, CA 93106 USA Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA Univ CalifSanta Barbara Santa Barbara CA USA 93106 Barbara, CA 93106 USA
Titolo Testata:
SCIENCE
fascicolo: 5540, volume: 294, anno: 2001,
pagine: 131 - 134
SICI:
0036-8075(20011005)294:5540<131:FIONSI>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
HETEROSTRUCTURE; GAAS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Awschalom, DD Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106USA Univ Calif Santa Barbara Santa Barbara CA USA 93106 106 USA
Citazione:
R.K. Kawakami et al., "Ferromagnetic imprinting of nuclear spins in semiconductors", SCIENCE, 294(5540), 2001, pp. 131-134

Abstract

We examine how a ferromagnetic layer affects the coherent electron spin dynamics in a neighboring gallium arsenide semiconductor. Uttrafast optical pump-probe measurements reveal that the spin dynamics are unexpectedly dominated by hyperpolarized nuclear spins that align along the ferromagnet's magnetization. We find evidence that photoexcited carriers acquire spin-polarization from the ferromagnet, and dynamically polarize these nuclear spins. The resulting hyperfine fields are as high as 9000 gauss in small external fields (less than 1000 gauss), enabling ferromagnetic control of local electron spin coherence.

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Documento generato il 10/07/20 alle ore 12:53:02