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Title: Quantum plasmonic nonreciprocity in parity-violating magnets
Authors: Arora, Arpit
Rudner, Mark S.
Song, Justin Chien Wen
Keywords: Science::Physics
Issue Date: 2022
Source: Arora, A., Rudner, M. S. & Song, J. C. W. (2022). Quantum plasmonic nonreciprocity in parity-violating magnets. Nano Letters, 22(23), 9351-9357.
Project: MOE2018-T3-1-002 
Journal: Nano Letters 
Abstract: The optical responses of metals are often dominated by plasmonic resonances, that is, the collective oscillations of interacting electron liquids. Here we unveil a new class of plasmons─quantum metric plasmons (QMPs)─that arise in a wide range of parity-violating magnetic metals. In these materials, a dipolar distribution of the quantum metric (a fundamental characteristic of Bloch wave functions) produces intrinsic nonreciprocal bulk plasmons. Strikingly, QMP nonreciprocity manifests even when the single-particle dispersion is symmetric: QMPs are sensitive to time-reversal and parity violations hidden in the Bloch wave function. In materials with asymmetric single-particle dispersions, quantum metric dipole induced nonreciprocity can continue to dominate at large frequencies. We anticipate that QMPs can be realized in a wide range of parity-violating magnets, including twisted bilayer graphene heterostructures, where quantum geometric quantities can achieve large values.
ISSN: 1530-6984
DOI: 10.1021/acs.nanolett.2c03126
Schools: School of Physical and Mathematical Sciences 
Rights: © 2022 American Chemical Society. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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