Plasmonic shock waves and solitons in a nanoring

Koshelev, Kirill; Kachorovskii, V. Yu.; Titov, M.; Shur, M. S.

doi:10.1103/physrevb.95.035418

Cited by 17 publications

(13 citation statements)

References 70 publications

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“…As a result, a static magnetic field is created inside the nanoparticle during the laser pulse. In future studies, it would be interesting to study other geometries such has nano-rings, since a resonant inverse Faraday effect was recently predicted in such nanostructures [27,58]. The computed induced magnetic moments in the nanoparticle are quite large, of about 0.35 µ B /atom for a laser intensity of 45 × 10 10 W/cm 2 .…”

Section: Discussionmentioning

confidence: 90%

Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect

et al. 2018

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We theoretically investigate the creation of a magnetic moment in gold nanoparticles by circularly polarized laser light. To this end, we describe the collective electron dynamics in gold nanoparticles using a semiclassical approach based on a quantum hydrodynamic model that incorporates the principal quantum many-body and nonlocal effects, such as the electron spill-out, the Hartree potential, and the exchange and correlation effects. We use a variational approach to investigate the breathing and the dipole dynamics induced by an external electric field. We show that gold nanoparticles can build up a static magnetic moment through the interaction with a circularly polarized laser field. We analyze that the responsible physical mechanism is a plasmonic, orbital inverse Faraday effect, which can be understood from the time-averaged electron current that contains currents rotating on the nanoparticle's surface. The computed laser-induced magnetic moments are sizeable, of about 0.35 µB/atom for a laser intensity of 45 × 10 10 W/cm 2 at plasmon resonance.

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Section: Discussionmentioning

confidence: 90%

Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect

et al. 2018

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“…Generation of stationary magnetic moment by a circularly polarized radiation is commonly referred to as the inverse Faraday effect (IFE) predicted by Pitaevskii [1] and first observed by van der Ziel et al [2]. Although this effect is usually studied in magnetic materials [3][4][5], it can be also observed in conventional semiconductor nanostructures such as quantum dots and nanorings [6][7][8][9][10][11][12][13][14][15]. In particular, it was recently predicted [14,15] that a circularly polarized radiation with the electric component E = E ω exp(−iωt) + c.c.…”

Section: Introductionmentioning

confidence: 99%

“…Although this effect is usually studied in magnetic materials [3][4][5], it can be also observed in conventional semiconductor nanostructures such as quantum dots and nanorings [6][7][8][9][10][11][12][13][14][15]. In particular, it was recently predicted [14,15] that a circularly polarized radiation with the electric component E = E ω exp(−iωt) + c.c. can excite a circular dc current in a nanoring, which, in turn, generates a magnetic moment…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Inverse Faraday Effect in Two Dimensional Electron Liquid

Potashin,

Kachorovskii,

Shur

2020

Preprint

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We show that a small conducting object, such as a nanosphere or a nanoring, embedded into or placed in the vicinity of the two-dimensional electron liquid (2DEL) and subjected to a circularly polarized electromagnetic radiation induces "twisted" plasmonic oscillations in the adjacent 2DEL. The oscillations are rectified due to the hydrodynamic nonlinearities leading to the helicity sensitive circular dc current and to a magnetic moment. This hydrodynamic Inverse Faraday Effect (HIFE) can be observed at room temperature in different 2D materials. The HIFE is dramatically enhanced in a periodic array of the nanospheres forming a resonant plasmonic coupler. Such a coupler exposed to a circularly polarized wave converts the entire 2DEL into a vortex state. Hence, the twisted plasmonic modes support resonant plasmonic-enhanced gate-tunable optical magnetization. Due to the interference of the plasmonic and Drude contributions, the resonances have an asymmetric Fanolike shape. These resonances present a signature of the 2DEL properties not affected by contacts and interconnects and, therefore, providing the most accurate information about the 2DEL properties. In particular, the widths of the resonances encode direct information about the momentum relaxation time and viscosity of the 2DEL.

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“…) which determines the width of the narrow boundary layer, where viscosity‐related friction dominates over

γ .

We also assume that the width of the channel is sufficiently large,

W ≫ L_{G} .

This condition allows to neglect the effects related to the friction of the viscous electron fluid within the narrow Gurzhi layer (

\approx L_{G}

) at the boundaries of the sample (for a more detailed discussion of effect of finite viscosity on plasmonic oscillations and transport see, respectively, refs. ).…”

mentioning

confidence: 97%

“…This condition can be easily fulfilled for clean samples. In particular, for GaAs with mobility

≳

10 5 cm V −1 s −1 at temperature about 30 K this condition is well satisfied for not too large concentrations

N ≲ 3 \times 10^{12} c {normalm}^{- 2}

. The hydrodynamic equations describing an electronic fluid in FET channel read

\frac{\partial v}{\partial t} + υ \frac{\partial v}{\partial x} + γ v = - \frac{e}{m} \frac{\partial U}{\partial x}, \frac{\partial U}{\partial t} + \frac{\partial true(U v true)}{\partial x} = 0

where

υ

is the velocity of the electronic fluid, and U is the local value of the gate‐to‐channel voltage, which, in the gradual channel approximation, is related to the local value of the electron concentration as

N true(x true) = C U true(x true) / e

.…”

mentioning

confidence: 99%

Plasmonic Helicity‐Driven Detector of Terahertz Radiation

Gorbenko

Kachorovskii

Shur

2018

Physica Rapid Research Ltrs

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A theory of the helicity‐driven plasmonic dc response of a gated two‐dimensional electron gas to terahertz (THz) radiation is developed. A general diagram of a plasmonic detector operating in different regimes is found and analytical equations describing all these regimes are derived. It is demonstrated that the helicity‐sensitive part of the response dramatically increases in the vicinity of the plasmonic resonances and oscillates with the phase shift between the excitation signals on the source and drain. The resonance line shape is an asymmetric function of the frequency deviation from the resonance. In contrast, the helicity‐insensitive part of the response is symmetrical. These properties yield significant advantage for using plasmonic detectors as helicity‐sensitive THz and far infrared spectrometers and interferometers.

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Plasmonic shock waves and solitons in a nanoring

Cited by 17 publications

References 70 publications

Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect

Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect

Hydrodynamic Inverse Faraday Effect in Two Dimensional Electron Liquid

Plasmonic Helicity‐Driven Detector of Terahertz Radiation

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