Publikation: THz quantum optics with dark excitons in Cu2O : from stimulated emission to nonlinear population control
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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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LEINSS, 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.200879859BibTex
@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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