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  Universal slow plasmons and giant field enhancement in atomically thin quasi-two-dimensional metals

da Jornada, F. H., Xian, L. D., Rubio, A., & Louie, S. G. (2020). Universal slow plasmons and giant field enhancement in atomically thin quasi-two-dimensional metals. Nature Communications, 11(1): 1013. doi:10.1038/s41467-020-14826-8.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-B132-A Version Permalink: https://hdl.handle.net/21.11116/0000-000B-AE5F-8
Genre: Journal Article

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This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
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 Creators:
da Jornada, F. H.1, 2, Author
Xian, L. D.3, 4, Author           
Rubio, A.3, 4, 5, Author           
Louie, Steven G.1, 2, Author
Affiliations:
1Department of Physics, University of California at Berkeley, ou_persistent22              
2Materials Sciences Division, Lawrence Berkeley National Laboratory, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Free-Electron Laser Science, ou_persistent22              
5Center for Computational Quantum Physics, Flatiron Institute, ou_persistent22              

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 Abstract: Plasmons depend strongly on dimensionality: while plasmons in three-dimensional systems start with finite energy at wavevector q = 0, plasmons in traditional two-dimensional (2D) electron gas disperse as ωp∼q√. However, besides graphene, plasmons in real, atomically thin quasi-2D materials were heretofore not well understood. Here we show that the plasmons in real quasi-2D metals are qualitatively different, being virtually dispersionless for wavevectors of typical experimental interest. This stems from a broken continuous translational symmetry which leads to interband screening; so, dispersionless plasmons are a universal intrinsic phenomenon in quasi-2D metals. Moreover, our ab initio calculations reveal that plasmons of monolayer metallic transition metal dichalcogenides are tunable, long lived, able to sustain field intensity enhancement exceeding 107, and localizable in real space (within ~20 nm) with little spreading over practical measurement time. This opens the possibility of tracking plasmon wave packets in real time for novel imaging techniques in atomically thin materials.

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Language(s): eng - English
 Dates: 2019-07-042020-02-052020-02-21
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1038/s41467-020-14826-8
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Project name : This work was supported by the Center for Computational Study of Excited-State Phenomena in Energy Materials (C2SEPEM) funded by the U.S. Department of Energy, Office of Basic Energy Sciences under Contract No. DE-AC02-05CH11231 at Lawrence Berkeley National Laboratory, as part of the Computational Materials Sciences Program, which provided for theory development, code implementation, and calculations. Computational resources were provided by the National Energy Research Scientific Computing Center (NERSC), which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, and the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by the National Science Foundation under Grant No. ACI-1053575. We acknowledge financial support from the European Research Council (ERC-2015-AdG-694097). The Flatiron Institute is a division of the Simons Foundation. The authors thank D. Basov, D.Y. Qiu, and H.S. Sen for helpful discussions.
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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: 11 (1) Sequence Number: 1013 Start / End Page: - Identifier: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723