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 T2* 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 1.4 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 T2* and the peak width of the NMR spectra.
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