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Published April 26, 2016 | Published + Supplemental Material + Submitted
Journal Article Open

Chiral plasmons without magnetic field

Abstract

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.

Additional Information

© 2016 National Academy of Sciences. Edited by Allan H MacDonald, The University of Texas at Austin, Austin, TX, and approved February 19, 2016 (received for review September 24, 2015). Published online before print April 11, 2016. We thank J. Alicea, J. Eisenstein, M. Kats, L. Levitov, M. Schecter, and B. Skinner for useful conversations. J.C.W.S. acknowledges support from the Walter Burke Institute for Theoretical Physics as part of a Burke fellowship at California Institute of Technology. M.S.R. acknowledges support from the Villum Foundation and the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under Research Executive Agency Grant PIIF-GA-2013-627838. Author contributions: J.C.W.S. and M.S.R. designed the research, performed the research, and wrote the paper. The authors declare no conflict of interest. This article is a PNAS Direct Submission. This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1519086113/-/DCSupplemental.

Attached Files

Published - PNAS-2016-Song-4658-63.pdf

Submitted - song_7.pdf

Supplemental Material - pnas.1519086113.sapp.pdf

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