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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.
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Edoardo Baldini, Adriel Dominguez, Tania Palmieri, Oliviero Cannelli, Angel Rubio, et al.. Exciton control in a room temperature bulk semiconductor with coherent strain pulses. Science Advances , American Association for the Advancement of Science (AAAS), 2019, 5 (11), pp.eaax2937. ⟨10.1126/sciadv.aax2937⟩. ⟨hal-02429866⟩



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