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  Photonic time-crystalline behaviour mediated by phonon squeezing in Ta2NiSe5

Michael, M., Haque, S. R. U., Windgätter, L., Latini, S., Zhang, Y., Rubio, A., Averitt, R. D., & Demler, E. (2024). Photonic time-crystalline behaviour mediated by phonon squeezing in Ta2NiSe5. Nature Communications, 15(1):. doi:10.1038/s41467-024-47855-8.

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アイテムのパーマリンク: https://hdl.handle.net/21.11116/0000-000F-3B16-7 版のパーマリンク: https://hdl.handle.net/21.11116/0000-000F-3B17-6
資料種別: 学術論文

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s41467-024-47855-8.pdf (出版社版), 3MB
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https://hdl.handle.net/21.11116/0000-000F-3B18-5
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s41467-024-47855-8.pdf
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Gold
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2024
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© The Author(s)
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suppl.zip (付録資料), 5MB
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https://hdl.handle.net/21.11116/0000-000F-3B19-4
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URL:
https://arxiv.org/abs/2207.08851 (プレプリント)
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OA-Status:
Gold

作成者

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 作成者:
Michael, M.1, 2, 著者
Haque, S. R. U.3, 4, 著者
Windgätter, L.2, 5, 著者           
Latini, S.2, 著者
Zhang, Y.3, 著者
Rubio, A.2, 6, 著者
Averitt, R. D.3, 著者
Demler, E.1, 7, 著者
所属:
1Department of Physics, Harvard University, ou_persistent22              
2Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
3Department of Physics, University of California San Diego, ou_persistent22              
4Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, ou_persistent22              
5International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266714              
6Center for Computational Quantum Physics, The Flatiron Institute, ou_persistent22              
7Institut for Theoretical Physics, ETH Zurich, ou_persistent22              

内容説明

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 要旨: Photonic time crystals refer to materials whose dielectric properties are periodic in time, analogous to a photonic crystal whose dielectric properties is periodic in space. Here, we theoretically investigate photonic time-crystalline behaviour initiated by optical excitation above the electronic gap of the excitonic insulator candidate Ta2NiSe5. We show that after electron photoexcitation, electron-phonon coupling leads to an unconventional squeezed phonon state, characterised by periodic oscillations of phonon fluctuations. Squeezing oscillations lead to photonic time crystalline behaviour. The key signature of the photonic time crystalline behaviour is terahertz (THz) amplification of reflectivity in a narrow frequency band. The theory is supported by experimental results on Ta2NiSe5 where photoexcitation with short pulses leads to enhanced THz reflectivity with the predicted features. We explain the key mechanism leading to THz amplification in terms of a simplified electron-phonon Hamiltonian motivated by ab-initio DFT calculations. Our theory suggests that the pumped Ta2NiSe5 is a gain medium, demonstrating that squeezed phonon noise may be used to create THz amplifiers in THz communication applications.

資料詳細

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言語: eng - English
 日付: 2023-09-232024-04-112024-04-29
 出版の状態: オンラインで出版済み
 ページ: -
 出版情報: -
 目次: -
 査読: 査読あり
 識別子(DOI, ISBNなど): arXiv: 2207.08851
DOI: 10.1038/s41467-024-47855-8
 学位: -

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Project information

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Project name : We acknowledge the fruitful discussion with Jonathan B. Curtis, Mohammad Hafezi, Andrey Grankin, Daniele Guerci, John Sous, Andy Millis, Martin Eckstein, and Hope Bretscher. M.H.M. is grateful for the financial support received from the Alexander von Humboldt postdoctoral fellowship. M.H.M., S.R.U.H., Y.Z., E.D., and R.D.A. acknowledge support from DARPA ‘Driven Nonequilibrium Quantum Systems’ (DRINQS) program under award no. D18AC00014. E.D. also acknowledges support from the ARO grant “Control of Many-Body States Using Strong Coherent Light-Matter Coupling in Terahertz Cavities” and the SNSF project 200021_212899. L.W., S.L. and A.R. acknowledge support from the European Research Council (ERC-2015-AdG694097), the Cluster of Excellence ‘Advanced Imaging of Matter’ (AIM), Grupos Consolidados (IT1249-19) and Deutsche Forschungsgemeinschaft (DFG) - SFB-925 - project 170620586. A.R. also thanks the Flatiron Institute, a division of the Simons Foundation. Open Access funding enabled and organized by Projekt DEAL.
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出版物 1

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出版物名: Nature Communications
  省略形 : Nat. Commun.
種別: 学術雑誌
 著者・編者:
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出版社, 出版地: -
ページ: - 巻号: 15 (1) 通巻号: 3638 開始・終了ページ: - 識別子(ISBN, ISSN, DOIなど): ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723