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Exciton control in a room temperature bulk semiconductor with coherent strain pulses
Abstract : Controlling the excitonic optical properties of room temperature semiconductors using time-dependent perturbations is key to future optoelectronic applications. The optical Stark effect in bulk and low-dimensional materials has recently shown exciton shifts below 20 meV. Here, we demonstrate dynamical tuning of the exciton properties by photoinduced coherent acoustic phonons in the cheap and abundant wide-gap semiconductor anatase titanium dioxide (TiO2) in single crystalline form. The giant coupling between the excitons and the photoinduced strain pulses yields a room temperature exciton shift of 30 to 50 meV and a marked modulation of its oscillator strength. An advanced ab initio treatment of the exciton-phonon interaction fully accounts for these results, and shows that the deformation potential coupling underlies the generation and detection of the giant acoustic phonon modulations.
https://hal-univ-lemans.archives-ouvertes.fr/hal-02429866
Contributeur : Pascal Ruello <>
Soumis le : lundi 6 janvier 2020 - 22:11:27
Dernière modification le : mercredi 25 mars 2020 - 09:21:37
Contributeur : Pascal Ruello <>
Soumis le : lundi 6 janvier 2020 - 22:11:27
Dernière modification le : mercredi 25 mars 2020 - 09:21:37
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