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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2010

Giant titanium electron wave function in gallium oxide : a potential electron-nuclear spin system for quantum information processing

Résumé

The hyperfine interactions of the unpaired electron with eight surrounding 69Ga and 71Ga nuclei in Ti-doped β-Ga2O3 were analyzed by electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) spectroscopies. They are dominated by strong isotropic hyperfine couplings due to a direct Fermi contact interaction with Ga nuclei in octahedral sites of rutile-type chains oriented along b axis, revealing a large anisotropic spatial extension of the electron wave function. Titanium in β-Ga2O3 is thus best described as a diffuse (Ti4+-e) pair rather than as a localized Ti3+. Both electron and 69Ga nuclear spin Rabi oscillations could be observed by pulsed EPR and pulsed ENDOR, respectively. The electron spin decoherence time is about 1 μs (at 4 K) and an upper bound of 520 μs (at 8 K) is estimated for the nuclear decoherence time. Thus, β-Ga2O3:Ti appears to be a potential spin-bus system for quantum information processing with a large nuclear spin quantum register.
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Dates et versions

hal-00561954 , version 1 (02-02-2011)

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F. Mentink-Vigier, L. Binet, G. Vignoles, D. Gourier, H. Vezin. Giant titanium electron wave function in gallium oxide : a potential electron-nuclear spin system for quantum information processing. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 82, pp.184414-1 - 184414-8. ⟨10.1103/PhysRevB.82.184414⟩. ⟨hal-00561954⟩
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