arXiv subjects

I. V. Gorbenko

Publications and source records attributed to I. V. Gorbenko.

6 recordsLinked to original sources

arXiv2026

Tunable massive and acoustic plasmons in two-dimensional plasmonic crystals

We theoretically investigate dispersion of plasma waves propagating in a lateral plasmonic crystal based on a two-dimensional electron system with grating gates. Two specific configurations are analyzed: a system with single grating gate having ungated gaps and a double-grating-gate system. We calculate the dispersion relations for the fundamental and several higher-order plasma modes, classifying them as either ${\it bright}$ or ${\it dark}$ excitations. At the boundaries of the Brillouin zones, the dispersion of both types of excitations is shown to be quadratic, justifying introduction of effective bright and dark plasmon masses. In the low-frequency limit, the plasmonic crystal spectrum exhibits an acoustic plasma mode characterized by a certain velocity. We demonstrate that the effective plasmon mass and acoustic velocity are highly sensitive to both the crystal geometry (specifically the lattice filling factor) and the gate voltages, enabling wide-range tunability.

cond-mat.mes-hall↗

arXiv2026

Ratchet effect in lateral plasmonic crystal: Giant enhancement due to interference of "bright" and "dark" modes

We develop a theory of the ratchet effect in a lateral plasmonic crystal (LPC) formed by a two dimensional electron gas under a periodic dual-grating gate. The system is driven by terahertz radiation, and the spatial asymmetry required for the generation of dc photocurrent is introduced by a phase shift between the radiation's near-field modulation and the static electron density profile. In contrast to the commonly used perturbative "minimal model" of the ratchet effect, which assumes weak density modulation, we solve the problem exactly with respect to the static gate-induced potential while treating the radiation field perturbatively. This approach reveals a dramatic enhancement of the plasmonic contribution to the ratchet current due to the interference of "bright" and "dark" plasmon modes, which are excited on an equal footing in the asymmetric LPC. Specifically, we predict a parametric growth of the plasmonic peak as compared with the Drude peak with increasing coupling, and the appearance of a dense super-resonant structure when the spacing between plasmonic sub-bands becomes larger than the damping rate. Hence, the dc response exhibits both resonant and super-resonant regimes observed in recent experiments on the radiation transmission through the LPC. The interplay of bright and dark modes, together with their interference, provides a powerful mechanism for controlling the magnitude and sign of the photocurrent by gate voltages and the radiation frequency.

cond-mat.mes-hall↗

arXiv2024

Lateral plasmonic crystals: Tunability, dark modes, and weak-to-strong coupling transition

We study transmission of the terahertz radiation through a two-dimensional electron gas with a concentration controlled by grating gate electrodes. Voltage applied to these electrodes creates a lateral plasmonic crystal with a gate-tunable band structure. We find that only a part of plasmonic modes of such a crystal is seen in the transmission spectrum for the case of homogeneous excitation (so-called bright modes), while there also exist dark modes which show up only in a case of inhomogeneous excitation. We develop a theory that describes both weak- to strong- coupling transition in the crystal with increasing depth of the density modulation and a transition from resonant to super-resonant regime with increasing quality factor of the structure. We discuss very recent experiment, where transmission of the terahertz radiation through GaN/AlGaN based grating gate periodic structures was studied. We argue that this experiment represents an evidence of formation of the lateral plasmonic crystal with the band structure fully controlled by the gate electrodes, in a full agreement with developed theory

cond-mat.mes-hall↗

arXiv2024

Lateral plasmonic superlattice in strongly dissipative regime

We calculate transmission coefficient, $\mathcal T,$ of terahertz radiation through lateral plasmonic superlattice with a unit cell consisting of two regions with different plasma wave velocities, $s_1$ and $s_2$ ($s_1 > s_2$). We generalize theory developed earlier for resonant case to the non-resonant regime, when the scattering rate, $γ,$ is large compared to fundamental gate-tunable frequencies $ω_{1,2}$ of plasma oscillations in both regions. We find that absorption, and consequently $\mathcal T$, strongly depends on density modulation amplitude and on the frequency of the incoming radiation. We describe evolution of the absorption with increasing of radiation frequency from the quasi-static regime of very low frequency to the high-frequency regime, identify several dissipation regimes and find analytical expression for absorption, and, accordingly, for $\mathcal T,$ in these regimes. A general phase diagram of non-resonant regime in the plane $(ω,ω_2)$ for fixed $ω_1$ is constructed. Most importantly, $\mathcal T$ sharply depends on the gate voltages and frequency. In particular, for $ω_2 \ll ω_1,$ $\mathcal T$ strongly varies on the very small frequency scale, $δω\ll γ,$ determined by the Maxwell relaxation, $δω\sim ω_1^2/γ,$ so that the superlattice shows high responsivity within the frequency band $δω.$

cond-mat.mes-hall↗

arXiv2019

Terahertz Plasmonic Detector Controlled by Phase Asymmetry

We demonstrate that phase-difference between terahertz signals on the source and drain of a field effect transistor (a TeraFET) induces a plasmon-assisted dc current, which is dramatically enhanced in vicinity of plasmonic resonances. We describe a TeraFET operation with identical amplitudes of radiation on source and drain antennas but with a phase-shift-induced asymmetry. In this regime, the TeraFET operates as a tunable resonant polarization-sensitive plasmonic spectrometer operating in the sub-terahertz and terahertz range of frequencies. We also propose an effective scheme of a phase-sensitive homodyne detector operating in a phase-asymmetry mode, which allows for a dramatic enhancement of the response. These regimes can be implemented in different materials systems including silicon. The p-diamond TeraFETs could support operation in the 200 to 600 GHz atmospheric windows.

cond-mat.mes-hall↗

arXiv2018

Plasmonic Helicity-Driven Detector of terahertz radiation

We develop a theory of the helicity driven nolinear dc response of gated two-dimensional electron gas to the terahertz radiation. We demonstrate that the helicity-sensitive part of the response dramatically increases in the vicinity of the plasmonic resonances and oscillates with the phase shift between 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 terahertz and far infrared spectrometers and interferometers.

cond-mat.mes-hall↗