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Chiral plasmons without magnetic field

Song, Justin C. W. and Rudner, Mark S. (2016) Chiral plasmons without magnetic field. Proceedings of the National Academy of Sciences of the United States of America, 113 (17). pp. 4658-4663. ISSN 0027-8424. PMCID PMC4855603. doi:10.1073/pnas.1519086113.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Information CentralArticle Paper
Song, Justin C. W.0000-0002-5175-6970
Rudner, Mark S.0000-0002-5150-6234
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
Group:Walter Burke Institute for Theoretical Physics, Institute for Quantum Information and Matter
Funding AgencyGrant Number
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Villum FoundationUNSPECIFIED
Marie Curie FellowshipPIIF-GA-2013-627838
Subject Keywords:topological materials; interactions; nonreciprocal response; Berry curvature
Issue or Number:17
PubMed Central ID:PMC4855603
Record Number:CaltechAUTHORS:20150702-150159835
Persistent URL:
Official Citation:Justin C. W. Song and Mark S. Rudner Chiral plasmons without magnetic field PNAS 2016 113 (17) 4658-4663; published ahead of print April 11, 2016, doi:10.1073/pnas.1519086113
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58761
Deposited By: Joy Painter
Deposited On:06 Jul 2015 15:48
Last Modified:05 May 2022 16:34

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