Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 17, Pages 4658-4663Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1519086113
Keywords
topological materials; interactions; nonreciprocal response; Berry curvature
Categories
Funding
- Villum Foundation
- People Programme (Marie Curie Actions) of European Union's Seventh Framework Programme under Research Executive Agency Grant [PIIF-GA-2013-627838]
- Walter Burke Institute for Theoretical Physics as part of a Burke fellowship at California Institute of Technology
- Villum Fonden [00007365] Funding Source: researchfish
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Plasmons, the collective oscillations of interacting electrons, possess emergent properties that dramatically alter the optical response of metals. We predict the existence of a new class of plasmons-chiral Berry plasmons (CBPs)-for a wide range of 2D metallic systems including gapped Dirac materials. As we show, in these materials the interplay between Berry curvature and electron-electron interactions yields chiral plasmonic modes at zero magnetic field. The CBP modes are confined to system boundaries, even in the absence of topological edge states, with chirality manifested in split energy dispersions for oppositely directed plasmon waves. We unveil a rich CBP phenomenology and propose setups for realizing them, including in anomalous Hall metals and optically pumped 2D Dirac materials. Realization of CBPs will offer a powerful paradigm for magnetic field-free, subwavelength optical nonreciprocity, in the mid-IR to terahertz range, with tunable splittings as large as tens of THz, as well as sensitive all-optical diagnostics of topological bands.
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