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  Exciton Control in a Room-Temperature Bulk Semiconductor with Coherent Strain Pulses

Baldini, E., Dominguez, A., Palmieri, T., Cannelli, O., Rubio, A., Ruello, P., et al. (2018). Exciton Control in a Room-Temperature Bulk Semiconductor with Coherent Strain Pulses.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B042-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B182-3
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1803.07666.pdf (Preprint), 5MB
 
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https://arxiv.org/abs/1803.07666 (Preprint)
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 Creators:
Baldini, E.1, Author
Dominguez, A.2, Author
Palmieri, T.3, Author
Cannelli, O.3, Author
Rubio, A.2, 4, Author              
Ruello, P.5, Author
Chergui, M.3, Author
Affiliations:
1Department of Physics, Massachusetts Institute of Technology, Cambridge, ou_persistent22              
2Departamento Fisica de Materiales, Universidad del Paìs Vasco, ou_persistent22              
3Laboratory of Ultrafast Spectroscopy, ISIC and Lausanne Centre for Ultrafast Science (LACUS),École Polytechnique Fédérale de Lausanne (EPFL), ou_persistent22              
4Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
5Institut des Molécules et Matériaux du Mans, UMR CNRS 6283, Le Mans Université, ou_persistent22              

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 Abstract: The coherent manipulation of excitons in bulk semiconductors via the lattice degrees of freedom is key to the development of acousto-optic and acousto-excitonic devices. Wide-bandgap transition metal oxides exhibit strongly bound excitons that are interesting for applications in the deep-ultraviolet, but their properties have remained elusive due to the lack of efficient generation and detection schemes in this spectral range. Here, we perform ultrafast broadband deep-ultraviolet spectroscopy on anatase TiO2 single crystals at room temperature, and reveal a dramatic modulation of the exciton peak amplitude due to coherent acoustic phonons. This modulation is comparable to those of nanostructures where exciton-phonon coupling is enhanced by quantum confinement, and is accompanied by a giant exciton shift of 30-50 meV. We model these results by many-body perturbation theory and show that the deformation potential coupling within the nonlinear regime is the main mechanism for the generation and detection of the coherent acoustic phonons. Our findings pave the way to the design of exciton control schemes in the deep-ultraviolet with propagating strain pulses.

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Language(s): eng - English
 Dates: 2018-03-202018-03-22
 Publication Status: Published online
 Pages: 27
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 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 1803.07666
 Degree: -

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