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Plasmon-Phonon-Polaritons in Encapsulated Phosphorene

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Abstract

We consider a system consists of a doped monolayer phosphorene embedded between two hexagonal boron nitride (hBN) slabs along the heterostructure direction. The wavevector azimuthal angle dependence of the plasmon-polariton and plasmon-phonon-polariton modes of the hybrid system are calculated based on the random-phase approximation at finite temperature. The collective modes illustrate strong anisotropy and strong coupling with phonon modes of the polar media, and furthermore, the Landau damping occurs due to the intraband processes when plasmon enters intraband electron-hole continuum. Our numerical results show that the plasmon mode is highly confined to the surface along the zigzag direction. Owing to the strong electron-phonon interaction, the phonon dispersions in the Reststrahlen bands are also angle-dependent. These results are also in agreement with those of the semiclassical model obtained in our calculations.

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Acknowledgments

We thank M. Polini for very useful discussions. This work is partially supported by Iran Science Elites Federation. R. A acknowledges Scuola Normale Superiore, Pisa for its hospitality during the period in which the final stage of this work is completed.

Funding

This work is partially supported by Iran Science Elites Federation.

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Authors and Affiliations

  1. Department of Physics, Kharazmi University, Tehran, 15719-14911, Iran

    Farnood Ghohroodi Ghamsari

  2. School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran, 19395-5531, Iran

    Farnood Ghohroodi Ghamsari & Reza Asgari

  3. School of Nano Science, Institute for Research in Fundamental Sciences (IPM), Tehran, 19395-5531, Iran

    Reza Asgari

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  1. Farnood Ghohroodi Ghamsari
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Correspondence to Farnood Ghohroodi Ghamsari.

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Ghohroodi Ghamsari, F., Asgari, R. Plasmon-Phonon-Polaritons in Encapsulated Phosphorene. Plasmonics 15, 1289–1304 (2020). https://doi.org/10.1007/s11468-019-01059-9

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