Edge modes and Fabry-Perot plasmonic resonances in anomalous-Hall thin films

Smith, Thomas Benjamin; Torre, Iacopo; Principi, Alessandro

doi:10.1103/physrevb.99.155422

Cited by 3 publications

(3 citation statements)

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“…While we have only considered concentric and eccentric Corbino disks due to their analytic properties, these results are predicted to also extend to systems with any simply-connected geometry provided that the outer edge acts as a drain, and a point source is applied to its interior. This reflects the topological nature of edge magnetoplasmons [41][42][43].…”

Section: Eccentric Corbino Disk -Numerical Resultsmentioning

confidence: 81%

Eccentric Corbino FET in magnetic field: a highly tunable photodetector

Winstanley,

Schomerus,

Principi

2020

Preprint

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We show that the application of reasonably small external magnetic fields can improve the photoresponse of graphene-based field effect transistors. The proposed device is based on a disk of gated bilayer graphene, such that the drain spans its circumference and a eccentric point-like source is connected to its interior. An AC THz potential difference is applied between source and gate while a static source-drain voltage, rectified by the nonlinearities of the electron liquid, is measured. Peaks in the rectified potential occur at frequencies that enable the excitation of standing plasma waves in the device. When a magnetic field is applied perpendicular to the device, the entirety of collective plasma modes is split into bulk and edge magnetoplasmons. These two branches of the collective spectrum produce two sets of resonant peaks, which exhibit different scalings with the applied magnetic field. Similar to the effect of changing a bias voltage in a nearby gate, the peak frequency can be shifted with the external magnetic field strength. More importantly, their magnitude can be enhanced or suppressed based on their proximity to the cyclotron frequency. Therefore, it becomes possible to isolate specific frequencies, by enhancing specific peaks and suppressing all others.

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Section: Eccentric Corbino Disk -Numerical Resultsmentioning

confidence: 81%

Eccentric Corbino FET in magnetic field: a highly tunable photodetector

Winstanley,

Schomerus,

Principi

2020

Preprint

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“…In our problem, the quasi-1D plasmon mode originates from the quantized 1D electron helical state. However, the 1D plasmons may also emerge from the bulk 2D continuum in the case of the spatially modulated conductivity …”

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confidence: 99%

“…However, the 1D plasmons may also emerge from the bulk 2D continuum in the case of the spatially modulated conductivity. 13 When THz radiation is applied to the system, as shown in Figure 1, the plasmon is transformed to another quasiparticle that is called plasmon-polariton. To find its dispersion, it is necessary to solve the Maxwell equation,…”

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confidence: 99%

Plasmon-Polariton from a Helical State in a Dirac Magnet

2019

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Optical field interacting with a topologically protected one-dimensional helical state is shown to support a one-dimensional plasmon-polariton that is characterized by a non-linear dispersion. In a two-dimensional Dirac magnet these electro-optical excitations are confined to domain walls, thus, offering a possibility to manipulate quantum optical states by altering magnetic domain configurations. An exact spectral equation for such topological plasmon-polariton is derived. PACS numbers:One of the key problems of the modern plasmonics is the search for the new material platforms supporting plasmonic excitations with sufficiently lower losses than in conventional plasmonic materials such as gold or silverBoltasseva2011. It was recently realized that the materials exhibiting topologically non-trivial electronic spectrum as well as certain broken symmetries can host extremely low loss plasmonic excitations. Namely, long-lived plasmons and plasmons polaritons have been predicted for a variety of topological and Chern insulators [1][2][3][4][5]. Moreover, materials with intrinsically broken time reversal symmetry such as Weyl semimetals have been reported to support low-loss plasmonic excitations [6][7][8][9].Dirac magnet is another example of a system with broken time reversal invariance. It can be realized, e. g., in the form of a ferromagnet thin film in a close proximity to a surface of 3D topological insulator or topological semimetal. A perpendicular-to-the plane magnetization component in the ferromagnet induces a finite effective mass of Dirac electrons in the topological insulator. As the result such a magnetic proximity opens up a band gap in the Dirac electron spectrum, which destroys the two-dimensional Dirac surface state. A one-dimensional domain wall in the ferromagnet is, however, imaged in the Dirac electron system as a zero mass line that supports a helical electronic state. The properties of such a state are similar to those of a quantum Hall edge state. The difference is that the helical state at the domain wall originates in the anomalous Hall effect in the Dirac magnet.The physics proposed can be realized e. g. in Bi 2 Se 3 /EuS interface, where the magnetic proximity effect on topological states has been already experimentally demonstrated [10,11]. One can also expect similar phenomena in ZrSiS thin crystal [12] that is weakly coupled through an oxide layer to a ferromagnetic thin film.In this letter we investigate how these helical electronic states may give rise to one dimensional plasmonpolariton excitations in the presence of THz radiation. Excitation and detection of the plasmon-polaritons are illustrated in Fig. 1 in a setup that is similar to the one used recently in a series of experiments with scattering SNOM technique [13-15]. FM TI SPP S-SNOM FIG. 1: Schematic image of the near-field optical imaging of the ferromagnetic wall via the excitation of the edge plasmonpolariton in Dirac magnet.For a sake of qualitative analysis we choose the simplest model of Dirac magnet that gives rise to...

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Giant resonant skew scattering of plasma waves in a two-dimensional electron gas

Finnigan,

Efimkin

2024

Phys. Rev. B

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Edge modes and Fabry-Perot plasmonic resonances in anomalous-Hall thin films

Cited by 3 publications

References 52 publications

Eccentric Corbino FET in magnetic field: a highly tunable photodetector

Eccentric Corbino FET in magnetic field: a highly tunable photodetector

Plasmon-Polariton from a Helical State in a Dirac Magnet

Giant resonant skew scattering of plasma waves in a two-dimensional electron gas

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