Dipole excitation of collective modes in viscous two-dimensional electron systems
Dipole excitation of collective modes in viscous two-dimensional electron systems
复制标题
粘性二维电子系统中集体模式的偶极子激发
DOI:
10.1103/physrevb.102.205411
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发表时间:
2020
影响因子:
3.7
通讯作者:
Margetis, Dionisios
中科院分区:
文献类型:
--
作者:
Andreeva, Vera;Bandurin, Denis A.;Luskin, Mitchell;Margetis, Dionisios
We describe the structure of the time-harmonic electromagnetic field of a vertical Hertzian electric dipole source radiating over an infinite, translation-invariant two-dimensional electron system. Our model for the electron flow takes into account the effects of shear and Hall viscosities as well as an external static magnetic field perpendicular to the sheet. We identify two wave modes, namely, a surface plasmon and a diffusive mode. In the presence of an external static magnetic field, the diffusive mode combines the features of both the conventional and Hall diffusion and may exhibit a negative group velocity. In our analysis, we solve exactly a boundary value problem for the time-harmonic Maxwell equations coupled with linearized hydrodynamic equations for the flat, two-dimensional material. By numerically evaluating the integrals for the electromagnetic field on the sheet, we find that the plasmon contribution dominates in the intermediate-field region of the dipole source. In contrast, the amplitude of the diffusive mode reaches its maximum value in the near-field region, and quickly decays with the distance from the source. We demonstrate that the diffusive mode can be distinguished from the plasmon in the presence of the static magnetic field, when the highly oscillatory plasmon is gapped and tends to disappear.
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DOI:
--
发表时间:
1946
期刊:
影响因子:
--
作者:
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通讯作者:
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影响因子:
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DOI:
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发表时间:
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作者:
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通讯作者:
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DOI:
--
发表时间:
2016
期刊:
影响因子:
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作者:
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