[111] Intrinsic Gap Mode Eigenvector in Zinc Blende Structure
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The intrinsic localized gap mode vibrating in the [111] direction is shown for zinc blende lattice. The amplitude of the central light ion is 12% of the nearest-neighbor distance (a/d=0.116). The frequency of the shown intrinsic gap mode lies 5% down in the gap between optic and acoustic phonon bands (W/W+=0.95). The magnitude of the vibrational eigenvector is enhanced by 2 times and the magnitude of the axial elastic distortion is enhanced by 10 times for clearity. Small red circles, light ions; large blue circles, heavy ions.
Last modified: April 3, 1997