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Relativistic Dopple...
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Thomson, Mark D.Physikalisches Institut, Goethe-University, D-60438 Frankfurt am Main,Germany
(författare)
Relativistic Doppler reflection as a probe for the initial relaxation of a non-equilibrium electron-hole plasma in silicon
- Artikel/kapitelEngelska2015
Förlag, utgivningsår, omfång ...
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2015-10-13
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Institute of Physics (IOP),2015
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electronicrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:liu-123876
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https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-123876URI
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https://doi.org/10.1088/1742-6596/647/1/012016DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:ref swepub-contenttype
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Ämneskategori:kon swepub-publicationtype
Anmärkningar
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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.
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Biuppslag (personer, institutioner, konferenser, titlar ...)
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Meng, FanqiPhysikalisches Institut, Goethe-University, D-60438 Frankfurt am am Main, Germany
(författare)
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Sernelius, Bo E.,1948-Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten(Swepub:liu)bose02
(författare)
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Roskos, Hartmut G.Physikalisches Institut, Goethe-University, D-60438 Frankfurt am Main
(författare)
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Physikalisches Institut, Goethe-University, D-60438 Frankfurt am Main,GermanyPhysikalisches Institut, Goethe-University, D-60438 Frankfurt am am Main, Germany
(creator_code:org_t)
Sammanhörande titlar
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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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