Physics – Condensed Matter – Materials Science
Scientific paper
2010-01-28
Physics
Condensed Matter
Materials Science
23 pages, 5 figures, 1 set of supporting information
Scientific paper
We experimentally observe the fast relaxation and relatively slow recombination dynamics of photogenerated electrons/holes in an epitaxial graphene-on-Si heterostructure under pumping with a 1550-nm, 80-fs pulsed fiber laser beam and probing with the corresponding terahertz (THz) beam generated by and synchronized with the pumping laser. The time-resolved electric-field intensity originating from the coherent terahertz photon emission is electro-optically sampled in total-reflection geometry. The Fourier spectrum from 1.8 to 5.2 THz agrees well the pumping photon spectrum. This result is attributed to amplified emission of THz radiation from the graphene sample stimulated by the THz probe beam, and provides evidence for the occurrence of negative dynamic conductivity in the terahertz spectral range.
Fukidome Hirokazu
Karasawa Hiromi
Komori Tsuneyoshi
Otsuji Taiichi
Ryzhii Victor
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