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Cited by 4Topological Materials and PhenomenaQuantum and electron transport phenomenaPlasmonic and Surface Plasmon Research

Mode conversion and resonant absorption in inhomogeneous materials with flat bands

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Kim, Kihong, Kim, Seulong·2022·Physical Review B
DOI 10.1103/physrevb.105.045136
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Abstract

Mode conversion of transverse electromagnetic waves into longitudinal oscillations and the associated resonant absorption of wave energy in inhomogeneous plasmas is a phenomenon that has been studied extensively in plasma physics. We show that precisely analogous phenomena occur generically in electronic and photonic systems where dispersionless flat bands and dispersive bands coexist in the presence of an inhomogeneous potential or medium parameter. We demonstrate that the systems described by the pseudospin-1 Dirac equation with two dispersive bands and one flat band display mode conversion and resonant absorption in a very similar manner to $p$-polarized electromagnetic waves in an unmagnetized plasma by calculating the mode conversion coefficient explicitly using the invariant imbedding method. We also show that a similar mode conversion process takes place in many other systems with a flat band such as pseudospin-2 Dirac systems, continuum models obtained for one-dimensional stub and sawtooth lattices, and two-dimensional electron systems with a quadratic band and a nearly flat band. We discuss some experimental implications of mode conversion in flat-band materials and metamaterials.

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Crossref · 10.1103/physrevb.105.045136

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  • No realistic system containing a conical intersection with pseudospin higher than one has been demonstrated until now.

    “Although there have been proposals for generalized conical intersections with arbitrary pseudospin [13,14], and pseudospin-2 ones have been considered theoretically [15,16], no realistic system containing a conical intersection with pseudospin higher than one has been demonstrated until now.”

    From Pseudospin-2 in photonic chiral borophene (2023) · cites this paper as [16]

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Related

Authors
Kim, K., & Kim, S.
Affiliations
Ajou University (KR)
ORCID
Venue
Physical Review B
Publisher
American Physical Society (APS)
Published
2022-01-25
Volume
105
Issue
4
ISSN
  • 2469-9950 (ISSN-L)
  • 2469-9969
DOI
10.1103/physrevb.105.045136
OpenAlex
W4206972860
Cited by
4
References
52
Citations by year
2024: 1 · 2023: 2 · 2022: 1
FWCI
0.41
Type
journal article
Language
en
Open access
Licence
link.aps.org/licenses/aps-default-license (vor)
Locations
  • Physical review. B./Physical review. B (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Figshare (submittedVersion, cc-by)
  • arXiv (Cornell University)
Funders
  • National Research Foundation of Korea (NRF-2020R1A2C1007655)
  • Ministry of Education (2021R1A6A1A10044950)
  • Global Frontier Program (2014M3A6B3063708)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum and electron transport phenomena
  • Physical Sciences › Engineering › Biomedical Engineering › Plasmonic and Surface Plasmon Research
Keywords
mode conversion, resonant absorption, flat bands, heterogeneous media, two-dimensional electron systems, metamaterials, invariant imbedding, transverse electromagnetic waves, p-polarized waves, inhomogeneous plasma

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