Localized plasmons in topological insulators
Here, we investigate in a fully quantum-mechanical manner how the many-body excitation spectrum of topological insulators is affected by the presence of long-range Coulomb interactions. In the one-dimensional Su-Schrieffer-Heeger model and its mirror-symmetric variant strongly localized plasmonic excitations are observed which originate from topologically nontrivial single-particle states. These “topological plasmons” inherit some of the characteristics of their constituent topological single-particle states, but they are not equally well protected against disorder due to the admixture of nontopological bulk single-particle states in the polarization function. The strength of the effective Coulomb interactions is also shown to have strong effects on the plasmonic modes. Furthermore, we show how external modifications via dielectric screening and applied electric fields with distinct symmetries can be used to study topological plasmons, thus allowing for experimental verification of our atomistic predictions.
- Research Organization:
- Univ. of Southern California, Los Angeles, CA (United States)
- Sponsoring Organization:
- Alexander von Humboldt Foundation; USDOE Office of Science (SC)
- Grant/Contract Number:
- FG03-01ER45908
- OSTI ID:
- 1800981
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 4 Vol. 101; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Control of plasmons in topological insulators via local perturbations
|
journal | September 2021 |
| Plasmonic Waveguides from Coulomb-Engineered Two-Dimensional Metals | text | January 2021 |
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