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Hyperbolic Polaritons in Topological Nodal Ring Semimetals
Ashutosh Singh1,2, Maria Sebastian1, Yuanping Chen3
1Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA.
Type I nodal ring semimetals exhibit unique optical properties due to their anisotropic electronic structure. These materials support tunable hyperbolic polaritons, enabling novel applications in wave manipulation and absorption.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Optoelectronics
Background:
- Mirror-symmetric systems can host gapless electronic states like nodal lines or rings.
- Strain engineering modifies these nodal rings, leading to diverse physical properties.
Purpose of the Study:
- Investigate the optical response and electromagnetic wave propagation in type I nodal ring semimetals.
- Characterize the anisotropic dielectric permittivity and resulting polaritons.
Main Methods:
- Analysis of low-energy quasiparticle dispersion (parabolic in kx, ky; linear in kz).
- Theoretical study of optical properties and electromagnetic wave interactions.
Main Results:
- Type I nodal ring semimetals display a highly anisotropic dielectric permittivity tensor.
- Optical response is plasmonic in one direction and dielectric in others.
- Normal modes (hyperbolic polaritons) emerge over a broad, tunable frequency range.
Conclusions:
- Hyperbolic polaritons in these semimetals offer insights into electronic structure near nodal rings.
- Tunable hyperbolic materials have potential applications in anomalous refraction, waveguiding, and perfect absorption.
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