Variation of self-energy and exciton-phonon coupling in KI and RbI with pressure
| Autor: | MJ Lipp, W. B. Daniels, J Blechschmidt |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Condensed matter physics Condensed Matter::Other Phonon Exciton Hydrostatic pressure Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Coupling (probability) Resonance (particle physics) Condensed Matter::Materials Science Laser linewidth Self-energy Polariton |
| Zdroj: | Physical Review B. 48:687-694 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.48.687 |
| Popis: | We measured the 1s exciton energies in KI and RbI versus temperature at three different pressures via three-photon-excitation spectroscopy. The observed excitations display a Lorentzian line shape, which can be viewed as evidence that excitons and phonons in KI and RbI are only weakly coupling. Using the weak-coupling model we were able to find values for the real part of the temperature-dependent self-energy of the 1s exciton (peak-shift parameter \ensuremath{\Delta}). We find that the absolute value of \ensuremath{\Delta} and the strength of the exciton-phonon coupling increase with pressure. We also studied the behavior of the linewidth of the 1s exciton-polariton resonance with pressure and temperature and found that it decreases with pressure. However, we do not think that the linewidth parameter \ensuremath{\Gamma} of the polariton can be rigorously interpreted as the imaginary part of the exciton self-energy. |
| Databáze: | OpenAIRE |
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