Coherence time of nuclear spins in GaAs quantum well probed by submicron-scale all-electrical nuclear magnetic resonance device

Takeshi Ota, Norio Kumada, Go Yusa, Sen Miyashita, Toshimasa Fujisawa, Yoshiro Hirayama

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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 T2 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 1.4ms 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.

Original languageEnglish
Pages (from-to)3115-3117
Number of pages3
JournalJapanese journal of applied physics
Volume47
Issue number4 PART 2
DOIs
Publication statusPublished - 2008 Apr 25

Keywords

  • Coherence time
  • Fractional quantum Hall state
  • Nuclear magnetic resonance
  • Nuclear spins
  • Quantum computation
  • Quantum well

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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