Electron spin coherence of phosphorus donors in isotopically purified 29Si

E. Abe, J. Isoya, K. M. Itoh

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Abstract

We investigate spin coherence time of electrons bound to phosphorus donors in silicon single crystals, employing a pulsed electron paramagnetic resonance technique. The samples were isotopically controlled so that they may possess different concentrations (about 5% and 100%) of 29Si, which is the only non-zero-spin (spin-1/2) stable isotope of Si. Both 29Si- concentration dependence and orientation dependence of the electron spin coherence time demonstrate that the decoherence is caused by spectral diffusion due to mutual flip-flops of the environmental nuclear spins. The detail analysis of spin echo decay curves enables the unique assignment of the host sites responsible for electron spin echo envelope modulation.

Original languageEnglish
Pages (from-to)157-161
Number of pages5
JournalJournal of Superconductivity and Novel Magnetism
Volume18
Issue number2
DOIs
Publication statusPublished - 2005 Dec 1

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Keywords

  • Coherence time
  • Electron spin qubit
  • Environmental nuclear spin
  • Silicon-based quantum computer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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