1108.4234 (Jianbo Hu et al.)

Delayed formation of coherent LO phonon-plasmon coupled modes in n-type
and p-type GaAs measured using a femtosecond coherent control technique    [PDF]

Jianbo Hu, Oleg V. Misochko, Arihiro Goto, Kazutaka G. Nakamura

Coherent control experiments using a pair of collinear femtosecond laser pulses have been carried out to manipulate longitudinal optical (LO) phonon-plasmon coupled (LOPC) modes in both p- and n-type GaAs. By tuning the interpulse separation, remarkably distinct responses have been observed in the two samples. To understand the results obtained a phenomenological model taking the delayed formation of coherent LOPC modes into account is proposed. The model suggests that the lifetime of coherent LOPC modes plays a key role and the interference of the coherent LO phonons excited successively by two pump pulses strongly affects the manipulation of coherent LOPC modes.

View original: http://arxiv.org/abs/1108.4234