@article{Lein2009quant-58378,
  year={2009},
  doi={10.1002/pssc.200879859},
  title={THz quantum optics with dark excitons in Cu<sub>2</sub>O : from stimulated emission to nonlinear population control},
  number={1},
  volume={6},
  issn={1862-6351},
  journal={Physica Status Solidi (C) - Current Topics in Solid State Physic},
  pages={156--161},
  author={Leinß, Silvan and Kampfrath, Tobias and Volkmann, Konrad von and Schmid, Ben A. and Fröhlich, Dietmar and Wolf, Martin and Kaindl, Robert A. and Leitenstorfer, Alfred and Huber, Rupert}
}

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    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2022-08-23T13:07:17Z</dc:date>
    <dcterms:title>THz quantum optics with dark excitons in Cu&lt;sub&gt;2&lt;/sub&gt;O : from stimulated emission to nonlinear population control</dcterms:title>
    <dc:contributor>Leitenstorfer, Alfred</dc:contributor>
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    <dc:contributor>Volkmann, Konrad von</dc:contributor>
    <dc:language>eng</dc:language>
    <dc:contributor>Kaindl, Robert A.</dc:contributor>
    <dc:contributor>Kampfrath, Tobias</dc:contributor>
    <dc:contributor>Wolf, Martin</dc:contributor>
    <dc:creator>Huber, Rupert</dc:creator>
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    <dc:creator>Fröhlich, Dietmar</dc:creator>
    <dc:contributor>Schmid, Ben A.</dc:contributor>
    <dc:creator>Volkmann, Konrad von</dc:creator>
    <dc:creator>Leinß, Silvan</dc:creator>
    <dc:contributor>Fröhlich, Dietmar</dc:contributor>
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    <dc:creator>Kampfrath, Tobias</dc:creator>
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    <dc:creator>Kaindl, Robert A.</dc:creator>
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    <dcterms:abstract xml:lang="eng">Fundamental quantum optical processes in photogenerated excitons in Cu&lt;sub&gt;2&lt;/sub&gt;O are demonstrated using few-cycle terahertz pulses and field-sensitive electro-optic sampling: (i) In a dilute ensemble of 3p excitons, stimulated terahertz emission from internal transitions to the energetically lower 2s state is observed at a photon energy of 6.6 meV, with a cross section of 10&lt;sup&gt;-14&lt;/sup&gt; cm&lt;sup&gt;2&lt;/sup&gt;. (ii) An optically dark, dense, and cold 1s-paraexciton gas is prepared by two-photon generation of electron-hole pairs and subsequent phonon cooling. Intense multi-terahertz fields of order MV/cm coherently promote 70% of the quasiparticles from the 1s to the 2p state via a partial internal Rabi oscillation. Electro-optic detection monitors the Larmor precession of the Bloch vector directly in the time domain, with femtosecond resolution.</dcterms:abstract>
    <dcterms:issued>2009</dcterms:issued>
    <dc:contributor>Huber, Rupert</dc:contributor>
    <dc:creator>Wolf, Martin</dc:creator>
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