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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., et al. (2024). Photonic time-crystalline behaviour mediated by phonon squeezing in Ta2NiSe5. Nature Communications, 15(1): 3638. doi:10.1038/s41467-024-47855-8.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000F-3B16-7 Version Permalink: https://hdl.handle.net/21.11116/0000-000F-3B17-6
Genre: Journal Article

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 Creators:
Michael, M.1, 2, Author
Haque, S. R. U.3, 4, Author
Windgätter, L.2, 5, Author           
Latini, S.2, Author
Zhang, Y.3, Author
Rubio, A.2, 6, Author
Averitt, R. D.3, Author
Demler, E.1, 7, Author
Affiliations:
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              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2023-09-232024-04-112024-04-29
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 2207.08851
DOI: 10.1038/s41467-024-47855-8
 Degree: -

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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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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Pages: - Volume / Issue: 15 (1) Sequence Number: 3638 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723