Coherent Phonons At A Semiconductor Surface
- Conference date: 13-15 March 2002
- Location: Shonan Village, Hayama (Japan)
Coherent surface phonon at a GaAs(100)‐c(8 × 2)‐Ga reconstructed surface has been investigated by time resolved second harmonic generation (TRSHG). The phonon mode is impulsively excited by an ultrashort laser pulse and subsequent coherent nuclear motion is monitored through the intensity modulation of the second harmonics of a probe pulse. Oscillatory traces are clearly observed in TRSHG signals and their Fourier transformation show two components, bulk LO‐phonon at 8.8 THz and the surface phonon at 6.0–8.6 THz. The frequency of the surface phonon shows red shift as the pumping power increases. The shifts are indicative of a marked electron phonon interaction or anharmonicity of the surface phonon modes.
- Semiconductor surfaces
- Surface reconstruction
- Fourier transforms
- Phonon interactions
- Red shift
- Second harmonic generation
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