Delocalized low-frequency magnetoplasmon in a two-dimensional electron fluid with cylindrical symmetry
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| Format: | Preprint |
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2024
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| _version_ | 1866929310917459968 |
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| author | Kostylev, I. Hatifi, M. Konstantinov, D. Chepelianskii, A. D |
| author_facet | Kostylev, I. Hatifi, M. Konstantinov, D. Chepelianskii, A. D |
| contents | The properties of a two-dimensional (2D) electron system can be drastically altered by a magnetic field applied perpendicular to the 2D plane. In particular, the frequency of its bulk collective excitations becomes gaped at the cyclotron frequency, while the low-frequency localized excitations, the edge magnetoplasmon (EMP), appear near the system's edge. A new type of the delocalized low-frequency excitations, the gradient magnetoplasmon (GMP), was recently shown to exist in a 2D electron system with a linear density gradient that breaks the system's cylindrical symmetry [Phys. Rev. B \textbf{103}, 075420 (2021)]. Like EMP, these new excitations are gapless and chiral, and originate from the classical Hall effect. Here we show that a similar magnetoplasmon mode can exist in a system with strongly-inhomogeneous radial distribution of the electron density that preserves the cylindrical symmetry. This is experimentally demonstrated in a pristine system of surface electrons on liquid helium and is confirmed by a numerical simulation. This result extends the variety of known collective excitations in a 2D charge system and presents electrons on helium as a promising model system for their study. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_07582 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Delocalized low-frequency magnetoplasmon in a two-dimensional electron fluid with cylindrical symmetry Kostylev, I. Hatifi, M. Konstantinov, D. Chepelianskii, A. D Mesoscale and Nanoscale Physics The properties of a two-dimensional (2D) electron system can be drastically altered by a magnetic field applied perpendicular to the 2D plane. In particular, the frequency of its bulk collective excitations becomes gaped at the cyclotron frequency, while the low-frequency localized excitations, the edge magnetoplasmon (EMP), appear near the system's edge. A new type of the delocalized low-frequency excitations, the gradient magnetoplasmon (GMP), was recently shown to exist in a 2D electron system with a linear density gradient that breaks the system's cylindrical symmetry [Phys. Rev. B \textbf{103}, 075420 (2021)]. Like EMP, these new excitations are gapless and chiral, and originate from the classical Hall effect. Here we show that a similar magnetoplasmon mode can exist in a system with strongly-inhomogeneous radial distribution of the electron density that preserves the cylindrical symmetry. This is experimentally demonstrated in a pristine system of surface electrons on liquid helium and is confirmed by a numerical simulation. This result extends the variety of known collective excitations in a 2D charge system and presents electrons on helium as a promising model system for their study. |
| title | Delocalized low-frequency magnetoplasmon in a two-dimensional electron fluid with cylindrical symmetry |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2404.07582 |