23 April 1998 Theory of coherent phonon oscillations in nonpolar and polar semiconductors
Author Affiliations +
A microscopic description of coherent phonon oscillations generated by femtosecond optical excitation in both polar and nonpolar semiconductors is presented. For nonpolar semiconductors such as Ge, we show that the coherent lattice displacement is related to a quantum-mechanical average of a single phonon creation operator and we derive the equation of motion for the coherent phonon amplitude. In polar materials such as GaAs there is also another driving force which is more effective, namely, the depolarization electric field created by the separation of electrons and holes in the applied DC field and we formulate a microscopic theory of the plasmon- phonon oscillations. Results show that for an idealized situation with homogeneous plasma density that plasmon-like oscillations dominate the transient behavior. However, once the inhomogeneous density distribution is taken into account, only density-independent LO phonon oscillations are present in the transient optical response.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Aleksey V. Kuznetsov, Aleksey V. Kuznetsov, Christopher J. Stanton, Christopher J. Stanton, } "Theory of coherent phonon oscillations in nonpolar and polar semiconductors", Proc. SPIE 3277, Ultrafast Phenomena in Semiconductors II, (23 April 1998); doi: 10.1117/12.306159; https://doi.org/10.1117/12.306159


Ultrafast spectroscopy of hot electron and hole dynamics in GaP
Proceedings of SPIE (September 27 2013)
Intersubband absorption in m-plane ZnO/ZnMgO MQWs
Proceedings of SPIE (February 23 2017)
Coherent plasmons in InSb
Proceedings of SPIE (February 14 2006)
Compact phonon-pumped terahertz laser
Proceedings of SPIE (July 28 2003)

Back to Top