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Equatorial magnetoplasma waves

Finnigan, C ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevB.105.205426
  3. Publisher: American Physical Society , 2022
  4. Abstract:
  5. Due to its rotation, Earth traps a few equatorial ocean and atmospheric waves, including Kelvin, Yanai, Rossby, and Poincaré modes. It has been recently demonstrated that the mathematical origin of equatorial waves is intricately related to the nontrivial topology of hydrodynamic equations describing oceans or the atmosphere. In the present work, we consider plasma oscillations supported by a two-dimensional electron gas confined at the surface of a sphere or a cylinder. We argue that in the presence of a uniform magnetic field, these systems host a set of equatorial magnetoplasma waves that are counterparts to the equatorial waves trapped by Earth. For a spherical geometry, the equatorial modes are well developed only if their penetration length is smaller than the radius of the sphere. For a cylindrical geometry, the spectrum of equatorial modes is weakly dependent on the cylinder radius, and it overcomes finite-size effects. We argue that this exceptional robustness can be explained by destructive interference effects. We discuss possible experimental setups, including grains and rods composed of topological insulators (e.g., Bi2Se3) or metal-coated dielectrics (e.g., Au2S). © 2022 American Physical Society
  6. Keywords:
  7. Bismuth compounds ; Electron gas ; Gold compounds ; Magnetoplasma ; Plasma oscillations ; Selenium compounds ; Spheres ; Atmospheric waves ; Equatorial waves ; Hydrodynamics equation ; Magnetoplasma waves ; Nontrivial topology ; Penetration length ; Poincare ; Spherical geometries ; Two-dimensional electron gas ; Uniform magnetic fields ; Cylinders (shapes)
  8. Source: Physical Review B ; Volume 105, Issue 20 , 2022 ; 24699950 (ISSN)
  9. URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.105.205426