Coherent phonon spectroscopy of GaP Schottky diode

Chang, Y.-M.
March 2003
Applied Physics Letters;3/17/2003, Vol. 82 Issue 11, p1781
Academic Journal
Coherent longitudinal optical and acoustic phonons in GaP Schottky diode are impulsively generated and detected with time-resolved second-harmonic generation. A coherent longitudinal optical (LO) phonon is launched in the near-surface depletion region of GaP. The dephasing time of this coherent LO phonon is ∼10 ps and mainly due to the anharmonic decay into two zone-edge half-energy longitudinal acoustic (LA) phonons. Simultaneously, a coherent LA wave packet is created in the metal-semiconductor interface via transient thermal absorption in the metal thin layer. This acoustic wave packet propagates into the bulk with the sound velocity ∼5.8 × l0[sup 5] cm/s of a GaP LA phonon.


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