Muonium as a shallow center in GaN.

نویسندگان

  • K Shimomura
  • R Kadono
  • K Ohishi
  • M Mizuta
  • M Saito
  • K H Chow
  • B Hitti
  • R L Lichti
چکیده

A paramagnetic muonium (Mu) state with an extremely small hyperfine parameter was observed for the first time in single-crystalline GaN below 25 K. It has a highly anisotropic hyperfine structure with axial symmetry along the <0001> direction, suggesting that it is located either at a nitrogen-antibonding or a bond-centered site oriented parallel to the c axis. Its small ionization energy (<or=14 meV) and small hyperfine parameter (approximately 10(-4) times the vacuum value) indicate that muonium in one of its possible sites produces a shallow state, raising the possibility that the analogous hydrogen center could be a source of n-type conductivity in as-grown GaN.

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عنوان ژورنال:
  • Physical review letters

دوره 92 13  شماره 

صفحات  -

تاریخ انتشار 2004