Frankfurt 2006 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 7: Photonik in komplexen und periodischen Strukturen I

Q 7.4: Vortrag

Montag, 13. März 2006, 11:55–12:10, H14

Quantum-optical and classical spectroscopy with radiatively coupled multi quantum-wells — •Marco Werchner, Martin Schäfer, Walter Hoyer, Mackillo Kira, and Stephan W. Koch — Department of Physics and Material Sciences Center, Philipps University, Marburg, Germany

The optical properties of multiple-quantum-well systems are in many respects different from single quantum-well results. Radiative-coupling effects have been observed for classical spectroscopy after coherent excitation [1] as well as for steady-state photoluminescence spectra in the incoherent regime [2].

Here, an extended microscopic theory compared to [2] is presented which allows one to study quantum excitation, i.e. the full dynamics after excitation with an incoherent light pulse. This theory is applied to analyze reflection and transmission spectra for such a quantum excitation. In particular, the influence of the quantum-well spacing is investigated. Key differences between quantum and classical excitation are shown to result from different dephasing characteristics of coherent and incoherent excitons.

[1] T. Stroucken, A. Knorr, P. Thomas, and S. W. Koch, Phys. Rev. B 53, 2026 (1996)

[2] M. Kira, F. Jahnke, W. Hoyer, and S. W. Koch, Prog. Quantum Electron. 23, 189 (1999)