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Intrinsically undamped plasmon modes in narrow electron bands

Author(s)
Lewandowski, Cyprian Krzysztof; Levitov, Leonid
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Abstract
Surface plasmons in 2-dimensional electron systems with narrow Bloch bands feature an interesting regime in which Landau damping (dissipation via electron–hole pair excitation) is completely quenched. This surprising behavior is made possible by strong coupling in narrow-band systems characterized by large values of the “fine structure” constant α = e2 /~κvF. Dissipation quenching occurs when dispersing plasmon modes rise above the particle–hole continuum, extending into the forbidden energy gap that is free from particle–hole excitations. The effect is predicted to be prominent in moiré graphene, where at magic twist-angle values, flat bands feature α 1. The extinction of Landau damping enhances spatial optical coherence. Speckle-like interference, arising in the presence of disorder scattering, can serve as a telltale signature of undamped plasmons directly accessible in near-field imaging experiments.
Date issued
2019-09-27
URI
https://hdl.handle.net/1721.1/124420
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Proceedings of the National Academy of Sciences of the United States of America
Publisher
Proceedings of the National Academy of Sciences
Citation
Lewandowski, Cyprian and Leonid Levitov. "Intrinsically undamped plasmon modes in narrow electron bands." Proceedings of the National Academy of Sciences of the United States of America 116 (2019): 20869-20874 © 2019 The Author(s)
Version: Final published version
ISSN
0027-8424
1091-6490
Keywords
Multidisciplinary

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