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- W2046456475 abstract "High-resolution (0.02 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$) infrared-absorption measurements show resolved gap modes for $^{10}mathrm{B}_{mathrm{Ga}}$ and $^{11}mathrm{B}_{mathrm{Ga}}$ impurities in GaP at 284.50 and 283.10 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, respectively. These frequencies and those from local modes for the same impurities are analyzed by a method using perfect lattice modes calculated by ab initio density-functional methods and Green's-function techniques for treating the modifications introduced by the defects. It is demonstrated that the large linewidth of 0.9 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ for the gap modes and their unusual shapes are due to the second-neighbor interactions with mixed $^{69}mathrm{Ga}$ and $^{71}mathrm{Ga}$ isotopes. The measured widths of the $^{10}mathrm{B}_{mathrm{Ga}}$ and $^{11}mathrm{B}_{mathrm{Ga}}$ local modes in GaP (0.6 and 0.9 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$) correlate with the host-lattice two-phonon densities at the appropriate frequencies (592.75 and 570.00 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, respectively). textcopyright{} 1996 The American Physical Society." @default.
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- W2046456475 date "1996-04-15" @default.
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- W2046456475 title "Measurements and analysis of the gap and local modes ofBGaimpurities in GaP" @default.
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- W2046456475 doi "https://doi.org/10.1103/physrevb.53.9863" @default.
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