B. Ewers, N. S. Köster, R. Woscholski, M. Koch, and S. Chatterjee
Faculty of Physics and Materials Sciences Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany
Faculty of Physics and Materials Sciences Center, Philipps-Universität Marburg, Renthof 5, D-35032 Marburg, Germany
G. Khitrova and H. M. Gibbs
College of Optical Sciences, The University of Arizona, 1630 E. University Boulevard, Tucson, Arizona 85719-0094, USA
College of Optical Sciences, The University of Arizona, 1630 E. University Boulevard, Tucson, Arizona 85719-0094, USA
A. C. Klettke, M. Kira, and S. W. Koch
Faculty of Physics and Materials Sciences Center, Philipps-Universität Marburg, Mainzer Gasse 33, D-35032 Marburg, Germany
Faculty of Physics and Materials Sciences Center, Philipps-Universität Marburg, Mainzer Gasse 33, D-35032 Marburg, Germany
Received 7 December 2011; revised 16 January 2012; published 6 February 2012
The interaction of coherent excitons with intense, single-cycle terahertz (THz) pulses is investigated. A significant bleaching of the 1s-exciton resonance develops into a splitting of the absorption peak and the emergence of pronounced wings with increasing THz field strength. A quantum-mechanical many-body analysis attributes the experimental observations to a transition from excitonic Rabi flopping to multi-THz-photon ionization and the population of optically dark exciton states with high quantum numbers.
©2012 American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevB.85.075307
DOI:
10.1103/PhysRevB.85.075307
PACS:
78.67.De, 42.65.Re, 78.47.D-
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