Cyclotron resonance overtones and near-field magnetoabsorption via terahertz Bernstein modes in graphene
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2106.02117.pdf
Description
Submitted version
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Author(s)
Bandurin, DA
Mönch, E
Kapralov, K
Phinney, IY
Lindner, K
Liu, S
Edgar, JH
Dmitriev, IA
Jarillo-Herrero, P
Svintsov, D
Date Issued
February 7, 2022
Journal
Nature Physics
Publisher
Springer Science and Business Media LLC
Citation
Bandurin, DA, Mönch, E, Kapralov, K, Phinney, IY, Lindner, K et al. 2022. "Cyclotron resonance overtones and near-field magnetoabsorption via terahertz Bernstein modes in graphene." Nature Physics.
Version
Original manuscript
Abstract
Two-dimensional electron systems subjected to a perpendicular magnetic field
absorb electromagnetic radiation via the cyclotron resonance (CR). Here we
report a qualitative breach of this well-known behaviour in graphene. Our study
of the terahertz photoresponse reveals a resonant burst at the main overtone of
the CR, drastically exceeding the signal detected at the position of the
ordinary CR. In accordance with the developed theory, the photoresponse
dependencies on the magnetic field, doping level, and sample geometry suggest
that the origin of this anomaly lies in the near-field magnetoabsorption
facilitated by the Bernstein modes, ultra-slow magnetoplasmonic excitations
reshaped by nonlocal electron dynamics. Close to the CR harmonics, these modes
are characterized by a flat dispersion and a diverging plasmonic density of
states that strongly amplifies the radiation absorption. Besides fundamental
interest, our experimental results and developed theory show that the radiation
absorption via nonlocal collective modes can facilitate a strong photoresponse,
a behaviour potentially useful for infrared and terahertz technology.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1038/s41567-021-01494-8
