Surface scattering amplitude for a spatially dispersive model dielectric

Wink, Samuel M., Muljarov, Egor A. ORCID: https://orcid.org/0000-0002-2878-4148, Langbein, Wolfgang ORCID: https://orcid.org/0000-0001-9786-1023 and Deng, Hai-Yao ORCID: https://orcid.org/0000-0001-6065-483X 2023. Surface scattering amplitude for a spatially dispersive model dielectric. Physical Review B (condensed matter and materials physics) 108 (24) , 245302. 10.1103/PhysRevB.108.245302

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Abstract

Recently, it was shown [H.-Y. Deng and E. A. Muljarov, Phys. Rev. B 106, 195301 (2022)] that the so-called additional boundary conditions (ABCs) had significant issues when describing the surface properties of spatially dispersive media and an alternative ABC-free theory was developed introducing the surface scattering amplitude (SSA), which determines how polarization waves are scattered by a surface. Here we analytically calculate the SSA for a spatially dispersive model dielectric using wave-scattering theory and discuss some emerging generic properties independent of the model. The model consists of a lattice of interacting harmonic oscillators which had historically been used to mimic local excitons. It was shown that for short-range interactions the SSA is a constant independent of where the polarization waves were originated, which is not the case for long-range interaction. The calculated optical properties of a slab verify the general ABC-free theory.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	2469-9950
Date of First Compliant Deposit:	10 December 2023
Date of Acceptance:	20 November 2023
Last Modified:	11 Dec 2023 15:19
URI:	https://orca.cardiff.ac.uk/id/eprint/164643

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