Physics – Condensed Matter
Scientific paper
2002-09-03
Physics
Condensed Matter
8 pages, 9 figures, submitted to Phys. Rev. B
Scientific paper
10.1063/1.1589601
Using synchronized near-infrared (NIR) and terahertz (THz) lasers, we have performed picosecond time-resolved THz spectroscopy of transient carriers in semiconductors. Specifically, we measured the temporal evolution of THz transmission and reflectivity after NIR excitation. We systematically investigated transient carrier relaxation in GaAs and InSb with varying NIR intensities and magnetic fields. Using this information, we were able to determine the evolution of the THz absorption to study the dynamics of photocreated carriers. We developed a theory based on a Drude conductivity with time-dependent density and density-dependent scattering lifetime, which successfully reproduced the observed plasma dynamics. Detailed comparison between experimental and theoretical results revealed a linear dependence of the scattering frequency on density, which suggests that electron-electron scattering is the dominant scattering mechanism for determining the scattering time. In InSb, plasma dynamics was dramatically modified by the application of a magnetic field, showing rich magneto-reflection spectra, while GaAs did not show any significant magnetic field dependence. We attribute this to the small effective masses of the carriers in InSb compared to GaAs, which made the plasma, cyclotron, and photon energies all comparable in the density, magnetic field, and wavelength ranges of the current study.
Chin A. H.
Kono Junichiro
Mitchell A. P.
Zudov M. A.
No associations
LandOfFree
Terahertz magneto-spectroscopy of transient plasmas in semiconductors does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Terahertz magneto-spectroscopy of transient plasmas in semiconductors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Terahertz magneto-spectroscopy of transient plasmas in semiconductors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-76220