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

S. Leinß, T. Kampfrath, K. V. Volkmann, B. A. Schmid, D. Fröhlich, M. Wolf, R. A. Kaindl, A. Leitenstorfer, R. Huber

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Fundamental quantum optical processes in photogenemted excitons in Cu 2O 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-para-exciton gas is prepared by two-photon generation of electronhole pairs and subsequent phonon cooling. Intense multi-terahertz fields of order MV/cm coherently promote 70% of the quasipaiticles from the 1s to the 2p state via a partial intentai Rabi oscillation. Electro-optic detection monitors the Larmor precession of the Bloch vector directly in the time domain, with femtosecond resolution.

Original languageEnglish (US)
Pages (from-to)156-161
Number of pages6
JournalPhysica Status Solidi (C) Current Topics in Solid State Physics
Volume6
Issue number1
DOIs
StatePublished - 2009
Externally publishedYes
Event8th International Conference on Excitonic Processes in Condensed Matter, EXCON'08 - Kyoto, Japan
Duration: Jun 22 2008Jun 27 2008

ASJC Scopus subject areas

  • Condensed Matter Physics

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