Title :
Observation of carrier relaxation and recombination dynamics in optically pumped epitaxial graphene heterostructures using terahertz emission spectroscopy
Author :
Karasawa, H. ; Komori, T. ; Watanabe, T. ; Suemitsu, M. ; Ryzhii, V. ; Otsuji, T.
Author_Institution :
RIEC, Tohoku Univ., Sendai, Japan
Abstract :
The authors experimentally observed the fast relaxation and relatively slow recombination dynamics of photogenerated electrons/holes in an epitaxial graphene heterostructure. The result well supports the occurrence of negative dynamic conductivity leading to the population inversion to making a new type of THz lasers.
Keywords :
carrier relaxation time; electron-hole recombination; optical pumping; organic semiconductors; submillimetre wave lasers; THz lasers; carrier relaxation; epitaxial graphene heterostructures; negative dynamic conductivity; optical pumping; photogenerated electrons/holes; population inversion; recombination dynamics; terahertz emission spectroscopy; Charge carrier processes; Conductivity; Electron optics; Optical films; Optical pumping; Phonons; Spectroscopy; Spontaneous emission; Stimulated emission; Surface emitting lasers;
Conference_Titel :
Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-4079-5
Electronic_ISBN :
978-1-4244-4080-1
DOI :
10.1109/CLEOE-EQEC.2009.5196405
