2021
DOI: 10.1021/acs.nanolett.1c01002
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Highly Confined Phonon Polaritons in Monolayers of Perovskite Oxides

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 oxide perovskites have been synthesized, which possess highly infraredactive phonon modes and a complex interplay of competing interactions. In this study, we evaluate central figures of merit for phonon polaritons in the tetragonal phases of the 2D perovskites SrTiO3, KTaO3, and LiNbO3,… Show more

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Cited by 18 publications
(29 citation statements)
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References 80 publications
(167 reference statements)
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“…[ 11 ] These results pave the way to the study of interfacial and 2D phenomena in perovskite oxides thin films. [ 127 ]…”
Section: Emerging Functionalities In Freestanding Perovskite Thin Filmsmentioning
confidence: 99%
“…[ 11 ] These results pave the way to the study of interfacial and 2D phenomena in perovskite oxides thin films. [ 127 ]…”
Section: Emerging Functionalities In Freestanding Perovskite Thin Filmsmentioning
confidence: 99%
“…Within the Reststrahlen band, anisotropic materials can exhibit interesting optical properties because of their crystal asymmetry. [ 24,25,31,72 ] The unequal responses between the in‐plane isotropic and out‐of‐plane dielectric tensor components allows for their product to be less than zero (Re(ε xx,yy ) * Re(ε zz ) < 0), and under these circumstances the isofrequency surface becomes an open hyperboloid, allowing the material to support high‐momenta (truek${{\bf \vec{k}}}$) hyperbolic phonon polaritons (HPhPs). [ 72–75 ] Conversely, when Re(ε xx,yy ) * Re(ε zz ) > 0, the in‐plane momentum of light within the material is bound by a closed ellipsoid isofrequency surface.…”
Section: Resultsmentioning
confidence: 99%
“…In the two-dimensional limit, the SPhP of a material becomes a 2D phonon polariton that is equivalent to the 2D LO mode due to its highly confined and evanescent character. [24,25,59] We start by summarizing the Born effective charges in the corresponding bulk 3D systems (Table 1). The first (last) two rows refer to the Born effective charge on the transition metal (chalcogen) atoms along the in-plane and out of plane directions.…”
Section: Born Effective Charge Calculationsmentioning
confidence: 99%
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“…In this case, the coupling between the plasma oscillations of the electron Fermi liquid, cavity, and antiferromagnetic collective modes are all taken to be important. This may be important in the context of overdoped cuprates [91,110,112,116], nickelates [242][243][244][245][246], correlated oxide heterostructures [165,247,248], and other compounds with spin-density wave tendencies [107,116,249].…”
Section: Discussionmentioning
confidence: 99%