Year: 1998
Type: article
Abstract: We report the observation of long-lived quantum beats in the 1LO assisted resonance fluorescence of the lowest A exciton in CdS with the twofold spin-degenerate exciton states split by magnetic fields up to 4 T. Excitation by picosecond laser pulses with small spectral width allows us to selectively probe the relaxation dynamics of exciton polaritons at the transverse exciton energy. In this energy region phonon relaxation processes are greatly reduced at low temperatures ( T = 2 K) leading to the observed long relaxation times of the order of 100 ps. The accuracy of the analysis of the beat signals can be improved by applying the method of linear prediction by singular-value decomposition. This scheme allows us to reveal very weak oscillations and to derive the total exciton splitting due to the magnetic field and due to the strain in the sample.
Authors: U Müller, H Stolz, W von der Osten
Institution: Paderborn University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funder: Deutsche Forschungsgemeinschaft
OpenAlex ID: W1963544401