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Chiral plasmons without magnetic field.

Justin C W Song1, Mark S Rudner2

  • 1Walter Burke Institute of Theoretical Physics, California Institute of Technology, Pasadena, CA 91125; Institute of Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125; Department of Physics, California Institute of Technology, Pasadena, CA 91125; justin.song.cw@gmail.com.

Proceedings of the National Academy of Sciences of the United States of America
|April 13, 2016
PubMed
Summary
This summary is machine-generated.

Scientists predict chiral Berry plasmons (CBPs), a new class of plasmons in 2D materials. These CBPs enable magnetic field-free optical nonreciprocity and offer sensitive diagnostics for topological bands.

Keywords:
Berry curvatureinteractionsnonreciprocal responsetopological materials

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Plasmons are collective electron oscillations that significantly modify metal optical properties.
  • Berry curvature and electron-electron interactions are key factors in exotic electronic phenomena.

Purpose of the Study:

  • To predict and characterize a new class of plasmons: chiral Berry plasmons (CBPs).
  • To explore the potential of CBPs for novel optical applications and material diagnostics.

Main Methods:

  • Theoretical prediction of chiral Berry plasmons in 2D metallic systems, including gapped Dirac materials.
  • Analysis of the interplay between Berry curvature and electron-electron interactions.
  • Investigation of plasmon confinement to system boundaries.

Main Results:

  • Existence of chiral Berry plasmons (CBPs) predicted in various 2D metallic systems.
  • CBPs exhibit chiral plasmonic modes at zero magnetic field due to Berry curvature and electron interactions.
  • CBP modes are confined to boundaries and show split energy dispersions for oppositely directed waves.
  • Proposed experimental setups for realizing CBPs in anomalous Hall metals and optically pumped 2D Dirac materials.

Conclusions:

  • Chiral Berry plasmons offer a pathway to magnetic field-free, subwavelength optical nonreciprocity in the mid-IR to terahertz range.
  • Tunable plasmonic splittings up to tens of THz are achievable.
  • CBPs provide a sensitive method for all-optical diagnostics of topological electronic bands.