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Relativistic Dopple...
Relativistic Doppler reflection as a probe for the initial relaxation of a non-equilibrium electron-hole plasma in silicon
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- Thomson, Mark D. (författare)
- Physikalisches Institut, Goethe-University, D-60438 Frankfurt am Main,Germany
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- Meng, Fanqi (författare)
- Physikalisches Institut, Goethe-University, D-60438 Frankfurt am am Main, Germany
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- Sernelius, Bo E., 1948- (författare)
- Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten
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- Roskos, Hartmut G. (författare)
- Physikalisches Institut, Goethe-University, D-60438 Frankfurt am Main
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(creator_code:org_t)
- 2015-10-13
- 2015
- Engelska.
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Ingår i: 19th International Conference on Electron Dynamics in Semiconductors, Optoelectronics and Nanostructures (EDISON'19). - : Institute of Physics (IOP). ; , s. 012016-012019
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https://doi.org/10.1...
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https://liu.diva-por... (primary) (Raw object)
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Abstract
Ämnesord
Stäng
- This paper reviews the status of investigations of the relativistic Doppler reflectionof a broadband terahertz pulse at a counter-propagating plasma front of photo-excited chargecarriers in undoped silicon. When a THz pulse with 20-THz bandwidth impinges onto amoving plasma front with a carrier density in the range of 1019 per cm3, one observes a spectralup-shift, which is, however, much less pronounced than expected from simulations assuming a Drude plasma characterized by a single carrier relaxation time τ of the order of 15-100 fs.Qualitative agreement between simulations and experiments can be achieved if τ is chosen tobe less than 5 fs. In order to explore carrier relaxation in more detail, optical-pump/THz-probeexperiments in the conventional co-propagation geometry were performed. If the pump-probedelay is long enough for monitoring of the equilibrium value of the scattering time, τ rangesfrom 200 fs at low carrier density to 20 fs in the 1019-cm-3 density range. For small (subpicosecond)pump-probe delay, the data reveal a significantly faster scattering, which slowsdown during energy relaxation of the charge carriers.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Relativistic Doppler reflection
- non-equilibrium electron-hole plasma
- relaxation
- silicon.
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)