Journal
NANO LETTERS
Volume 22, Issue 23, Pages 9351-9357Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c03126
Keywords
nonreciprocal plasmons; bulk directional currents; quan t u m metric dipole; twisted bilaye r graphene
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Funding
- Singapore MOE [MOE2018-T3-1-002]
- Nanyang Technological University start-up grant (NTU-SUG)
- University of Washington College of Arts and Sciences
- Kenneth K Young Professorship
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This study reveals a new type of plasmons, called quantum metric plasmons (QMPs), which appear in parity-violating magnetic metals and exhibit nonreciprocal properties. The research finds that QMPs are sensitive to time-reversal and parity violations, even when the single-particle dispersion is symmetric.
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.
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