TY - JOUR
T1 - Highly Confined Phonon Polaritons in Monolayers of Perovskite Oxides
AU - Juraschek, Dominik M.
AU - Narang, Prineha
N1 - Publisher Copyright:
© 2021 The Authors. Published by American Chemical Society.
PY - 2021/6/23
Y1 - 2021/6/23
N2 - 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.
AB - 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.
KW - Phonon polaritons
KW - hexagonal boron nitride
KW - perovskite oxides
KW - two-dimensional materials
UR - http://www.scopus.com/inward/record.url?scp=85108608773&partnerID=8YFLogxK
U2 - 10.1021/acs.nanolett.1c01002
DO - 10.1021/acs.nanolett.1c01002
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C2 - 34101474
AN - SCOPUS:85108608773
SN - 1530-6984
VL - 21
SP - 5098
EP - 5104
JO - Nano Letters
JF - Nano Letters
IS - 12
ER -