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Sökning: WFRF:(Hsu L.) > (2001-2004)

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  • Hsu, L, et al. (författare)
  • Resonant interaction between localized and extended vibrational modes in Si: O-18 under pressure
  • 2003
  • Ingår i: Physical Review Letters. - 1079-7114. ; 90:9
  • Tidskriftsartikel (refereegranskat)abstract
    • The interaction between localized and extended vibrational modes in solids is of central importance in understanding how local vibrational modes decay into phonons. Interstitial oxygen (O-i) in silicon is a model system for studying such interactions. Using hydrostatic pressure, we have brought the antisymmetric stretch mode of O-18(i) in silicon into resonance with the second harmonic of the O-18(i) resonant mode. Infrared spectroscopy was used to observe an anticrossing between these two vibrational modes at pressures near 4 GPa. A model of the interaction between these modes produced excellent agreement with the experimentally observed frequencies and linewidths.
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3.
  • McCluskey, MD, et al. (författare)
  • Interaction between localized and extended modes of oxygen in silicon
  • 2003
  • Ingår i: Physica B: Condensed Matter. - : Elsevier BV. - 0921-4526. ; 340, s. 514-517
  • Tidskriftsartikel (refereegranskat)abstract
    • The interaction between localized and extended vibrational modes in solids is of central importance in understanding how local vibrational modes (LVMs) decay into phonons. In this study, we have investigated interstitial oxygen (O-i) in silicon as a model 'laboratory' for such local-extended mode interactions. Using hydrostatic pressure and infrared spectroscopy, we brought the stretch mode of O-18(i) in silicon into resonance with a second harmonic of the O-18(i) resonant mode. The resonant interaction results in an avoided crossing between the modes. In addition to this anti-crossing behaviour, the line width abruptly increases, due to a dramatic decrease in lifetime as the LVM enters the two-phonon continuum. A model of the interaction between these modes produced excellent agreement with the experimentally observed frequencies and line widths. (C) 2003 Elsevier B.V. All rights reserved.
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