Title :
Time-resolved THz spectroscopy: charge carrier dynamics and the role of strongly coupled optical phonons in ultrathin graphite sheets
Author :
Frischkorn, C. ; Kampfrath, T. ; Perfetti, L. ; Schapper, F. ; Wolf, M.
Author_Institution :
Fachbereich Phys., Freie Univ. Berlin, Germany
Abstract :
Ultrafast charge carrier dynamics in graphite are investigated by time-resolved THz spectroscopy. Our data show that: (i) more than 90% of the initially deposited excitation energy is transferred to few strongly coupled lattice vibrations within 500 fs; and (ii) these optical phonons substantially contribute to the striking increase of the Drude relaxation rate.
Keywords :
carrier relaxation time; lattice dynamics; phonons; submillimetre wave spectroscopy; 500 fs; Drude relaxation rate; charge carrier dynamics; deposited excitation energy; strongly coupled lattice vibrations; strongly coupled optical phonons; time-resolved THz spectroscopy; ultrathin graphite sheets; Charge carriers; Nonlinear optics; Optical coupling; Optical films; Optical mixing; Optical pumping; Phonons; Pulse amplifiers; Spectroscopy; Ultrafast optics;
Conference_Titel :
Infrared and Millimeter Waves and 13th International Conference on Terahertz Electronics, 2005. IRMMW-THz 2005. The Joint 30th International Conference on
Print_ISBN :
0-7803-9348-1
DOI :
10.1109/ICIMW.2005.1572604
