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

Leinß, S.; Kampfrath, T.; Volkmann, K. v.; Schmid, B. A.; Fröhlich, D.; Wolf, Martin; Kaindl, R. A.; Leitenstorfer, A.; Huber, R.

doi:10.1002/pssc.200879859

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

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Citation

Leinß, S., Kampfrath, T., Volkmann, K. v., Schmid, B. A., Fröhlich, D., Wolf, M., et al. (2008). THz quantum optics with dark excitons in Cu₂O: from stimulated emission to nonlinear population control. Physica Status Solidi C, 6(1), 156-161. doi:10.1002/pssc.200879859.

Cite as: https://hdl.handle.net/21.11116/0000-000E-3A1D-2

Abstract

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.