Femtosecond nonlinear coherence spectroscopy of carrier dynamics in porous silicon

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Title: Femtosecond nonlinear coherence spectroscopy of carrier dynamics in porous silicon
Author(s): Dao, Lap Van; Hannaford, Peter
Abstract: Multidimensional nonlinear coherence spectroscopy based on spectrally resolved femtosecond two-color three-pulse photon echo measurements are used to investigate carrier dynamics and energy structures in porous silicon samples, an indirect band-gap material. Short time scales for electron localization (~500 fs) and electron hopping (~3 ps) are observed which are dependent on the porosity of the samples. A spin-orbit splitting for the conduction band of 4–5 meV is deduced. The observed energy splittings of 18 and 22 meV for the 48% porosity sample and 21 and 28 meV for the 70% porosity sample are assigned to spin-orbit splitting for the valence band.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy
Source: Journal of Applied Physics, Vol. 98, no. 8 (Oct 2005)
Publication year: 2005
Publisher: American Institute of Physics
ISSN: 0021-8979
Publisher URL: http://dx.doi.org/10.1063/1.2102070
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