Crossover from proximity to ordinary two-dimensional plasma excitation

Muravev, V. M.; Andreev, I. V.; Semenov, N. D.; Gubarev, S. I.; Кукушкин, И. В.

doi:10.1103/physrevb.103.125308

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…Therefore, in similar cases of confined geometry, for example, for the disk-shaped gate, we will refer to all modes as neargate plasmons. Existence of such plasmons has been ex- perimentally confirmed in 2D electron systems based on GaAs/AlGaAs quantum wells with stripe-shaped [13,14] and disk-or ring-shaped [15,16] geometry of the gate. Mention that these modes were called "proximity plasmons" in Refs.…”

Section: Introductionmentioning

confidence: 82%

“…However, a technique used to discover the near-gate plasmons in the conventional heterostructures [13][14][15][16] enables to determine only their frequencies rather than spatial distribution of electric field for corresponding mode determined by quantization numbers. It may prevent extraction of the true dispersion of the near-gate plasmons, characterizing by orbital and radial quantization numbers, in the structures with disk-shaped gate, as the modes with the different numbers can have close eigen frequencies (as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Quasi-stationary near-gate plasmons in van der Waals heterostructures

Zabolotnykh,

Enaldiev,

Volkov

2021

Preprint

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Near-gate plasmons are a new type of plasma oscillations emerging in homogeneous twodimensional electron systems where a gate provides partial screening of electron-electron interaction.Here we develop a theory of the near-gate plasmons in van der Waals heterostructures comprising a conducting layer separated by a thin insulator from an uncharged disk-shaped gate. We show that in these structures the near-gate plasmons form gate-size-quantized quasi-stationary discrete modes even in the collisionless limit. Belonging to continuum spectrum of two-dimensional plasmons outside of the disk-gate, the near-gate plasmons are manifested as Fano-like resonances in frequency and magnetodispersions of scattering cross-section of the former scattered off the region under the gate. This enables to recover spectrum of the near-gate plasmons in the van der Waals heterostructures using near-field imaging techniques.

show abstract

Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Quasi-stationary near-gate plasmons in van der Waals heterostructures

Zabolotnykh,

Enaldiev,

Volkov

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Now let us move to the case of plasmons in 2DES with the disk-shaped gate [ 74 , 75 , 76 , 77 ]; see Figure 4 b. In this case, the frequencies of near-gate plasmons are governed by discrete numbers; the first is orbital number l , and the second is radial number N .…”

Section: Partially Gated Infinite 2d Electron Systemsmentioning

confidence: 99%

Two-Dimensional Plasmons in Laterally Confined 2D Electron Systems

2023

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The collective oscillations of charge density (plasmons) in conductive solids are basic excitations that determine the dynamic response of the system. In infinite two-dimensional (2D) electron systems, plasmons have gapless dispersion covering a broad spectral range from subterahertz to infrared, which is promising in light-matter applications. We discuss the state-of-the-art physics of 2D plasmons, especially in confined 2D electron systems in stripe and disk geometry, using the simplest approach for conductivity. When the metal gate is placed in the vicinity of the 2D electron system, an analytical description of the plasmon frequency and damping can be easily obtained. We also analyze gated plasmons in the disk when it was situated at various distances from the gate, and discuss in detail the nontrivial behavior of the damping. We predict that it is not a simple sum of the radiative and collisional dampings, but has a nonmonotonic dependence on the system parameters. For high-mobility 2D systems, this opens the way to achieve the maximal quality factor of plasma resonances. Lastly, we discuss the recently discovered near-gate 2D plasmons propagating along the laterally confined gate, even without applied bias voltage and having gapless dispersion when the gate has the form of a stripe, and discrete spectrum when the gate is in the form of disk. It allows for one to drive the frequency and spatial propagation of such plasmons.

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Magnetoplasmon resonance in two-dimensional fluctuating superconductors

2021

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We develop a theory of the magnetoplasmon resonance (MPR) in two-dimensional superconductors in the fluctuating regime, where the temperature is slightly above the critical temperature of the superconducting transition. In this regime, unpaired electrons and fluctuating Cooper pairs coexist in the system and interact with each other via long-range Coulomb forces, forming a Bose–Fermi mixture. The sample is considered to be under the influence of an external time-dependent electromagnetic field with a frequency in sub-terahertz range and a permanent magnetic field. It is shown that the MPR of the system is strongly modified in the presence of superconducting fluctuations in the vicinity of the superconducting transition. In particular, the fluctuating Cooper pairs dramatically change the broadening of the MPR, which is reflected in the optical response of the system.

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Crossover from proximity to ordinary two-dimensional plasma excitation

Cited by 6 publications

References 34 publications

Quasi-stationary near-gate plasmons in van der Waals heterostructures

Quasi-stationary near-gate plasmons in van der Waals heterostructures

Two-Dimensional Plasmons in Laterally Confined 2D Electron Systems

Magnetoplasmon resonance in two-dimensional fluctuating superconductors

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