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  Unravelling the intertwined atomic and bulk nature of localised excitons by attosecond spectroscopy

Lucchini, M., Sato, S., Lucarelli, G. D., Moio, B., Inzani, G., Borrego-Varillas, R., et al. (2021). Unravelling the intertwined atomic and bulk nature of localised excitons by attosecond spectroscopy. Nature Communications, 12: 1021. doi:10.1038/s41467-021-21345-7.

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https://arxiv.org/abs/2006.16008 (Preprint)
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https://dx.doi.org/10.1038/s41467-021-21345-7 (Publisher version)
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 Creators:
Lucchini, M.1, 2, Author
Sato, S.3, 4, Author              
Lucarelli, G. D.1, 2, Author
Moio, B.1, Author
Inzani, G.1, Author
Borrego-Varillas, R.2, Author
Frassetto, F.5, Author
Poletto, L.5, Author
Hübener, H.4, Author              
de Giovannini, U.4, 6, Author              
Rubio, A.4, 6, Author              
Nisoli, M.1, 2, Author
Affiliations:
1Department of Physics, Politecnico di Milano, ou_persistent22              
2Institute for Photonics and Nanotechnologies, IFN-CNR, Milano, ou_persistent22              
3Center for Computational Sciences, University of Tsukuba, ou_persistent22              
4Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
5Institute for Photonics and Nanotechnologies, IFN-CNR, Padova, ou_persistent22              
6Nano-Bio Spectroscopy Group, Universidad del País Vasco, ou_persistent22              

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 Abstract: The electro-optical properties of most semiconductors and insulators of technological interest are dominated by the presence of electron-hole quasi-particles, called excitons. The manipulation of excitons in dielectrics has recently received great attention, with possible applications in different fields including optoelectronics and photonics. Here, we apply attosecond transient reflection spectroscopy in a sequential two-foci geometry and observe sub-femtosecond dynamics of a core-level exciton in bulk MgF2 single crystals. Furthermore, we access absolute phase delays, which allow for an unambiguous comparison with theoretical calculations. Our results show that excitons surprisingly exhibit a dual atomic- and solid-like character, which manifests itself on different time scales. While the former is responsible for a femtosecond optical Stark effect, the latter dominates the attosecond excitonic response. Further theoretical investigation reveals a link with the exciton sub-femtosecond nanometric motion and allows us to envision a new route to control exciton dynamics in the close-to-petahertz regime.

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Language(s): eng - English
 Dates: 2020-11-032021-01-252021-02-15
 Publication Status: Published online
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2006.16008
DOI: 10.1038/s41467-021-21345-7
 Degree: -

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Grant ID : 848411
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

Source 1

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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 12 Sequence Number: 1021 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723