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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. (2020). Unravelling the intertwined atomic and bulk nature of localised excitons by attosecond spectroscopy.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-A07D-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-A07E-8
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2006.16008.pdf (Preprint), 2MB
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2006.16008.pdf
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2020
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https://arxiv.org/abs/2006.16008 (Preprint)
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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 quasiparticles called excitons. The manipulation of these hydrogen-like quasi-particles in dielectrics, has received great interest under the name excitonics that is expected to be of great potential for a variety of applications, including optoelectronics and photonics. A crucial step for such exploitation of excitons in advanced technological applications is a detailed understanding of their dynamical nature. However, the ultrafast processes unfolding on few-femtosecond and attosecond time scales, of primary relevance in view of the desired extension of electronic devices towards the petahertz regime, remain largely unexplored. 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. With our unique setup, we can access absolute phase delays which allow for an unambiguous comparison with theoretical calculations based on the Wannier-Mott model. 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 and originates by the interaction with the crystal. Further investigation of the role of exciton localization proves that the bulk character persists also for strongly localised quasi-particles 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: 2020-06-29
 Publication Status: Published online
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 2006.16008
 Degree: -

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