Highly Confined Phonon Polaritons in Monolayers of Perovskite Oxides

Dominik M. Juraschek, Prineha Narang

Research output: Contribution to journalArticlepeer-review

Abstract

Two-dimensional (2D) materials are able to strongly confine light hybridized with collective excitations of atoms, enabling electric-field enhancements and novel spectroscopic applications. Recently, freestanding monolayers of perovskite oxides have been synthesized, which possess highly infrared-active phonon modes and a complex interplay of competing interactions. Here, we show that this new class of 2D materials exhibits highly confined phonon polaritons by evaluating central figures of merit for phonon polaritons in the tetragonal phases of the 2D perovskites SrTiO3, KTaO3, and LiNbO3, using density functional theory calculations. Specifically, we compute the 2D phonon-polariton dispersions, the propagation-quality, confinement, and deceleration factors, and we show that they are comparable to those found in the prototypical 2D dielectric hexagonal boron nitride. Our results suggest that monolayers of perovskite oxides are promising candidates for polaritonic platforms that enable new possibilities in terms of tunability and spectral ranges.

Original languageEnglish
Pages (from-to)5098-5104
Number of pages7
JournalNano Letters
Volume21
Issue number12
DOIs
StatePublished - 23 Jun 2021
Externally publishedYes

Keywords

  • Phonon polaritons
  • hexagonal boron nitride
  • perovskite oxides
  • two-dimensional materials

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