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  Unconventional excitonic states with phonon sidebands in layered silicon diphosphide

Zhou, L., Huang, J., Windgätter, L., Ong, C. S., Zhao, X., Zhang, C., et al. (2022). Unconventional excitonic states with phonon sidebands in layered silicon diphosphide. Nature Materials, 21(7), 773-778. doi:10.1038/s41563-022-01285-3.

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Source data: Statistical Source Data Fig. 1-4 (.xlsx)
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https://doi.org/10.1038/s41563-022-01285-3 (Publisher version)
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https://arxiv.org/abs/2206.08030 (Preprint)
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https://doi.org/10.1038/s41563-022-01306-1 (Supplementary material)
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News & Views article "A tale of two dimensionalities" by Matthieu Fortin-Deschênes and Fengnian Xia

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 Creators:
Zhou, L.1, Author
Huang, J.1, Author
Windgätter, L.2, 3, Author              
Ong, C. S.4, 5, Author
Zhao, X.6, Author
Zhang, C.1, Author
Tang, M.1, Author
Li, Z.1, Author
Qiu, C.1, Author
Latini, S.2, 3, Author              
Lu, Y.7, 8, Author
Wu, D.1, Author
Gou, H.9, Author
Wee, A. T. S.10, Author
Hosono, H.7, Author
Louie, S. G.4, 5, Author
Tang, P.2, 3, 11, Author              
Rubio, A.2, 3, 11, 12, Author              
Yuan, H.1, Author
Affiliations:
1National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
3Center for Free-Electron Laser Science, Hamburg, ou_persistent22              
4Department of Physics, University of California, ou_persistent22              
5Materials Sciences Division, Lawrence Berkeley National Laboratory, ou_persistent22              
6School of Materials Science and Engineering, Peking University, ou_persistent22              
7Materials Research Center for Element Strategy, Tokyo Institute of Technology, ou_persistent22              
8College of Materials Science and Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, ou_persistent22              
9Center for High Pressure Science and Technology Advanced Research, Beijing, ou_persistent22              
10Department of Physics, National University of Singapore, ou_persistent22              
11School of Materials Science and Engineering, Beihang University, ou_persistent22              
12Center for Computational Quantum Physics, Simons Foundation, Flatiron Institute, ou_persistent22              

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 Abstract: Complex correlated states emerging from many-body interactions between quasiparticles (electrons, excitons and phonons) are at the core of condensed matter physics and material science. In low-dimensional materials, quantum confinement affects the electronic, and subsequently, optical properties for these correlated states. Here, by combining photoluminescence, optical reflection measurements and ab initio theoretical calculations, we demonstrate an unconventional excitonic state and its bound phonon sideband in layered silicon diphosphide (SiP2), where the bound electron–hole pair is composed of electrons confined within one-dimensional phosphorus–phosphorus chains and holes extended in two-dimensional SiP2 layers. The excitonic state and emergent phonon sideband show linear dichroism and large energy redshifts with increasing temperature. Our ab initio many-body calculations confirm that the observed phonon sideband results from the correlated interaction between excitons and optical phonons. With these results, we propose layered SiP2 as a platform for the study of excitonic physics and many-particle effects.

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Language(s): eng - English
 Dates: 2021-06-022022-05-102022-06-162022-07
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41563-022-01285-3
arXiv: 2206.08030
 Degree: -

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Project name : A.R. acknowledges support from the European Research Council (ERC-2015-AdG-694097), Grupos Consolidados (IT1249-19) and the Max Planck-New York City Center for Non-Equilibrium Quantum Phenomena. [...] L.W. acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy–Cluster of Excellence Advanced Imaging of Matter (AIM) EXC 2056-390715994 and by the DFG–SFB-925–project 170620586.
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Source 1

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Title: Nature Materials
  Abbreviation : Nat. Mater.
Source Genre: Journal
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Affiliations:
Publ. Info: London, UK : Nature Pub. Group
Pages: - Volume / Issue: 21 (7) Sequence Number: - Start / End Page: 773 - 778 Identifier: ISSN: 1476-1122
CoNE: https://pure.mpg.de/cone/journals/resource/111054835734000