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- W4313332359 abstract "We calculate the absorption spectra of a conductive disk in the presence of a metal gate. In our analysis, we use the conductivity described by the Drude model. We examine the frequency and line width of the absorption resonances associated with the excited plasma waves. They are estimated both numerically and analytically for the fundamental and axisymmetric plasma modes. The line width is determined by the collisional and radiative losses. In high mobility samples, the latter may dominate even when the resonant frequencies can be described by a standard quasistatic approximation, i.e., neglecting electromagnetic retardation. Placing a metal near the disk drastically affects the radiative broadening of the line width due to the interference of electromagnetic fields created by the disk and the metal charges. Bringing the disk in close proximity to the gate makes the total field almost vanish. In that case, the line width is defined solely by the collisional broadening. As the disk is moved away from the gate, the line width first shows a reduction since the plasmon transforms into plasmon-polariton, which is dressed with undamped electromagnetic field surrounding the disk. Then it increases and exhibits decaying oscillations, reaching the asymptotic value of the ungated disk." @default.
- W4313332359 created "2023-01-06" @default.
- W4313332359 creator A5002306334 @default.
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- W4313332359 date "2022-12-29" @default.
- W4313332359 modified "2023-09-29" @default.
- W4313332359 title "Oscillations in radiative damping of plasma resonances in a gated disk of a two-dimensional electron gas" @default.
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- W4313332359 doi "https://doi.org/10.1103/physrevb.106.235431" @default.
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