Bogolon-mediated electron capture by impurities in hybrid Bose-Fermi systems

We investigate the processes of electron capture by a Coulomb impurity center residing in a hybrid system consisting of spatially separated two-dimensional layers of electron and Bose-condensed dipolar exciton gases coupled via the Coulomb forces. We calculate the probability of the electron capture accompanied by the emission of a single Bogoliubov excitation (bogolon), similar to regular phonon-mediated scattering in solids. Further, we study the electron capture mediated by the emission of a pair of bogolons in a single capture event and show that these processes not only should be treated in the same order of the perturbation theory, but also they give more important contribution than single bogolon-mediated capture, in contrast with regular phonon scattering.Comment: Paper: 5 pages, 4 figure

Impurity-band optical transitions in two-dimensional Dirac materials under strain-induced synthetic magnetic field

We develop a theory of optical transitions in Coulomb impurity-doped two-dimensional transition metal dichalcogenide monolayers and study the transitions from the spin-resolved valence band to the (Coulomb) donor and acceptor impurities under the influence of a synthetic valley-selective magnetic field produced by a mechanical strain. It is shown that the optical properties of the system are determined by the strength of the synthetic magnetic field, which uncovers an experimental tool, which can be used to manipulate the properties of two-dimensional materials in valley magneto-optoelectronics.Comment: Manuscript: 9 pages, 5 figure

Effect of titanium on the primary radiation damage and swelling of vanadium-titanium alloys

In this paper, a molecular dynamic study of the atomic displacement cascade development in pure vanadium and V-Ti alloys with titanium concentrations of 4, 8, and 16% is carried out for energies of a primary knocked-out atom of 5, 10, and 20 keV. The interactions between atoms in the V-Ti system are specified in the framework of a method developed earlier for modeling systems with metallic and covalent types of chemical bon

Molecular dynamics simulation of primary radiation damage in vanadium and alloy V-4Ti

The interatomic interaction in V and alloy V-4Ti was described on the base of modern potentials of interatomic interactions which took into account the interaction of screened ions at small interatomic distances and allowed to simulate correctly radiation damage. The main characteristics of atomic displacement cascades in simulated crystallites were calculated: the number of defects at different stages of cascade development, the size of the radiation-damaged regions, and an analysis of the estimation of the number, types and sizes of the surviving radiation defects in crystallites. The results obtained are compared for vanadium and alloy V-4T

Digitalization of public administration: expert reflection on problems and challenges

In the article, the authors identified a set of conditions and factors that both hinder and facilitate the transformation of public administration as a public-state system for coordinating and realizing the interests of representatives of stakeholders through the use of the potential of digital and information and telecommunication technologies. In the course of the study, the following tasks were solved: the role of digitalization for the public administration system was assessed, the problems of this process were identified, the possibilities of electronic online platforms in the organization of social networking in the “governance – society” dyad were evaluated. The article presents the results of a focused group semi-formalized online interview in the format of video conferencing on the Zoom platform, conducted in December 2021 among 20 experts. The experts were representatives of public authorities at the federal, regional and local levels, state corporations, civil society structures, business structures, the scientific community, as well as the Russian Regional Management Center. Based on the analysis of the results of the expert survey, the authors conclude that the digitalization of the activities of the authorities gives a good increase not only in improving the quality of service provision to the country’s population, but also in improving the feedback mechanism, increasing the involvement of the population in the process of solving socially significant issues. This gives hope that the resolution of problems associated with the introduction of digital technologies into the work of government bodies with the population will contribute to the transition from informing and servicing citizens to interactive communication with them

Genome assembly using quantum and quantum-inspired annealing

Recent advances in DNA sequencing open prospects to make whole-genome analysis rapid and reliable, which is promising for various applications including personalized medicine. However, existing techniques for {\it de novo} genome assembly, which is used for the analysis of genomic rearrangements, chromosome phasing, and reconstructing genomes without a reference, require solving tasks of high computational complexity. Here we demonstrate a method for solving genome assembly tasks with the use of quantum and quantum-inspired optimization techniques. Within this method, we present experimental results on genome assembly using quantum annealers both for simulated data and the $\phi$X 174 bacteriophage. Our results pave a way for an increase in the efficiency of solving bioinformatics problems with the use of quantum computing and, in particular, quantum annealing. We expect that the new generation of quantum annealing devices would outperform existing techniques for {\it de novo} genome assembly. To the best of our knowledge, this is the first experimental study of de novo genome assembly problems both for real and synthetic data on quantum annealing devices and quantum-inspired techniques.Comment: 9 pages, 4 figure

Self-point defect trapping responsible for radiation swelling reduction in V-Ti alloys

The very low swelling of V-Ti alloys under neutron irradiation is a poorly understood phenomenon. To uncover the underlying mechanism of swelling reduction, we performed density functional theory and molecular dynamics simulations with a V-4% Ti random alloy with interatomic potentials. We find that titanium solutes efficiently trap vacancies and self-interstitial atom