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  Phonon-Driven Selective Modulation of Exciton Oscillator Strengths in Anatase TiO2 Nanoparticles

Baldini, E., Palmieri, T., Dominguez, A., Ruello, P., Rubio, A., & Chergui, M. (2018). Phonon-Driven Selective Modulation of Exciton Oscillator Strengths in Anatase TiO2 Nanoparticles. Nano Letters, 18(8), 5007-5014. doi:10.1021/acs.nanolett.8b01837.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B275-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-A4C9-1
Genre: Journal Article

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 Creators:
Baldini, E.1, 2, Author
Palmieri, T.2, Author
Dominguez, A.3, Author
Ruello, P.4, Author
Rubio, A.3, 5, Author              
Chergui, M.2, Author
Affiliations:
1Department of Physics, Massachusetts Institute of Technology, Cambridge, ou_persistent22              
2Laboratory of Ultrafast Spectroscopy, ISIC and Lausanne Centre for Ultrafast Science (LACUS), École Polytechnique Fédérale de Lausanne (EPFL), ou_persistent22              
3Departamento Fisica de Materiales, Universidad del Paìs Vasco, ou_persistent22              
4Institut des Molécules et Matériaux du Mans, UMR CNRS 6283, ou_persistent22              
5Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              

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Free keywords: anatase TiO2; coherent acoustic phonons; deep-ultraviolet; excitons; nanoparticles; Ultrafast spectroscopy
 Abstract: The way nuclear motion affects electronic responses has become a very hot topic in materials science. Coherent acoustic phonons can dynamically modify optical, magnetic and mechanical properties at ultrasonic frequencies, with promising applications as sensors and transducers. Here, by means of ultrafast broadband deep-ultraviolet spectroscopy, we demonstrate that coherent acoustic phonons confined in anatase TiO2 nanoparticles can selectively modulate the oscillator strength of the two-dimensional bound excitons supported by the material. We use many-body perturbation-theory calculations to reveal that the deformation potential is the mechanism behind the generation of the observed coherent acoustic wavepackets. Our results offer a route to manipulate and dynamically tune the properties of excitons in the deep-ultraviolet at room temperature.

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Language(s): eng - English
 Dates: 2018-05-012018-05-032018-08
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1805.00552
DOI: 10.1021/acs.nanolett.8b01837
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Project name : We acknowledge support by the Swiss NSF via the NCCR:MUST and PNR70:407040_154056, and by the European Research Council Advanced Grants DYNAMOX 695197 and QSped-NewMat. E.B. acknowledges support by the Swiss NSF under Fellowship P2ELP2_172290.
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Title: Nano Letters
  Abbreviation : Nano Lett.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: 8 Volume / Issue: 18 (8) Sequence Number: - Start / End Page: 5007 - 5014 Identifier: ISSN: 1530-6984
CoNE: https://pure.mpg.de/cone/journals/resource/110978984570403