Coherence Time of Nuclear Spins in GaAs Quantum Well Probed by Submicron-Scale All-Electrical Nuclear Magnetic Resonance Device
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概要
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We study the coherence time of nuclear spins of 75As nuclei in a GaAs quantum well using a submicron-scale all-electrical nuclear magnetic resonance (NMR) device. We estimate the extrinsic transverse relaxation time $T_{2}^{*}$ and intrinsic transverse relaxation time $T_{2}$ of nuclear spins using different pulse sequences to measure the decay of spin–echo signals. We significantly improve the coherence time from 0.05 to 1.4 ms by eliminating the spatial field inhomogeneity and temporal fluctuation of surrounding electrons and nuclei with the aid of heteronuclear and electron–nuclear spin decoupling techniques. By analyzing the data, we extract individual sources of decoherence in GaAs. We discuss the relationship between the obtained $T_{2}^{*}$ and the peak width of the NMR spectra.
- 2008-04-25
著者
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Ota Takeshi
Ntt Basic Research Laboratories Ntt Corporation
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Yusa Go
Ntt Basic Research Laboratories Ntt Corporation
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MIYASHITA Sen
NTT-AT
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Hirayama Yoshiro
Ntt Basic Research Laboratories
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Fujisawa Toshimasa
Ntt Basic Research Laboratories
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Kumada Norio
NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
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Ota Takeshi
NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
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Yusa Go
NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
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Miyashita Sen
NTT-AT, Atsugi, Kanagawa 243-0198, Japan
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