The authors study the photoluminescence spectra of two-dimensional electron systems in the 1 to 2 range of filling factors at a temperature of 40 mK. Plasmaron peaks and their restructuring in the spectrum are identified at a filling factor of 4/3. Additional peaks referred to as double plasmarons are detected at high pumping powers, indicating complex interactions within the system.
The resonant photoluminescence of an excited Laughlin liquid at an electron filling factor of 1/3 was studied. It was shown that, for a neutral defect in a Laughlin liquid that consists of an electron at the upper spin sublevel of the zero Landau level and a valence hole, the influence of random potential fluctuations on the probability of optical recombination of the defect is suppressed (random potential superscreening). Filling the Laughlin liquid with single-spin excitations (spin-magnetogravitons) does not affect this observation.
Correlation of the temperature dependences of Raman scattering and ferromagnetic resonance is found in nanowires of a dilute magnetic semiconductor Ge0.99Co0.01. A sudden “softening” of optical phonon lines occurs at T ≈ 74 K. The observed behavior indicates a strong interaction of carriers not only with phonons but also with the magnetic system.
An equation of continuity for a fluid is derived using Euler’s Principia motus fluidorum with high-order terms of smallness containing quadratic and cubic invariants of the strain rate tensor. The wave equation for the intensity of an electric field is derived using Maxwell’s system of electrodynamics equations with allowance for quadratic and cubic invariants, which describe the generation of waves of the electric field’s intensity.
The authors study the temporal evolution of polarized spectra of emissions from spinor exciton‒polariton condensates in double tunnel-coupled potential traps inside a high-Q GaAs/AlAs microcavity at 2 K under resonance laser pumping with picosecond pulses at times of up to 1.5 ns. The time of the condensates’ spin relaxation in a double trap is estimated as τs ≈ 10 ns. The effect of tunnel interaction and anisotropy of the trap potential on the energy spectrum of the polariton modes and the polarization dynamics of the spinor condensate in tunnel-coupled potential traps is discussed.
The properties of a silicon-based plasmonic detector of electromagnetic radiation were examined in the low-frequency range (0.1–20 GHz). The sensitive element of the detector was embedded in a matched coplanar waveguide, through which electromagnetic radiation was conveyed. The dependence of the constant voltage arising at the detector output on the frequency of the incident radiation was measured. The power characteristics of the detector were measured, and the threshold radiation power at which the detector transitions into a nonlinear regime was determined.
The authors consider different approaches to creating a strengthening surface based on a track-etched polyethylene terephthalate membrane. The stability of the covering and the potential use of the obtained substrates are evaluated using the example of an aptasensor for identifying the influenza A virus.
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