%0 Journal Article %T Exciton control in a room temperature bulk semiconductor with coherent strain pulses %+ Institut des Sciences et Ingénierie Chimiques (ISIC) %+ Lausanne Centre for Ultrafast Science (LACUS) %+ Universidad del Pais Vasco / Euskal Herriko Unibertsitatea [Espagne] (UPV/EHU) %+ Max Planck Institute for the Structure and Dynamics of Matter (MPSD) %+ Institut des Molécules et Matériaux du Mans (IMMM) %+ Laboratoire de spectroscopie ultrarapide %A Baldini, Edoardo %A Dominguez, Adriel %A Palmieri, Tania %A Cannelli, Oliviero %A Rubio, Angel %A Ruello, Pascal %A Chergui, Majed %< avec comité de lecture %@ 2375-2548 %J Science Advances %I American Association for the Advancement of Science (AAAS) %V 5 %N 11 %P eaax2937 %8 2019-11-29 %D 2019 %R 10.1126/sciadv.aax2937 %Z Physics [physics]/Condensed Matter [cond-mat] %Z Physics [physics]/Condensed Matter [cond-mat]/Strongly Correlated Electrons [cond-mat.str-el]Journal articles %X 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. %G English %L hal-02429866 %U https://hal-univ-lemans.archives-ouvertes.fr/hal-02429866 %~ CNRS %~ UNIV-LEMANS %~ INC-CNRS %~ IMMM-LEMANS %~ TEST-HALCNRS