THz quantum optics with dark excitons in Cu2O : from stimulated emission to nonlinear population control

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2009
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Leinß, Silvan
Kampfrath, Tobias
Volkmann, Konrad von
Schmid, Ben A.
Fröhlich, Dietmar
Kaindl, Robert A.
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Physica Status Solidi (C) - Current Topics in Solid State Physic. Wiley. 2009, 6(1), pp. 156-161. ISSN 1862-6351. eISSN 1610-1642. Available under: doi: 10.1002/pssc.200879859
Zusammenfassung

Fundamental quantum optical processes in photogenerated excitons in Cu2O 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 10-14 cm2. (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.

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ISO 690LEINSS, Silvan, Tobias KAMPFRATH, Konrad von VOLKMANN, Ben A. SCHMID, Dietmar FRÖHLICH, Martin WOLF, Robert A. KAINDL, Alfred LEITENSTORFER, Rupert HUBER, 2009. THz quantum optics with dark excitons in Cu2O : from stimulated emission to nonlinear population control. In: Physica Status Solidi (C) - Current Topics in Solid State Physic. Wiley. 2009, 6(1), pp. 156-161. ISSN 1862-6351. eISSN 1610-1642. Available under: doi: 10.1002/pssc.200879859
BibTex
@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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