Surface acoustic wave modulation of single photon emission from GaN/InGaN nanowire quantum dots

On-chip quantum information processing requires controllable quantum light sources that can be operated on-demand at high-speeds and with the possibility of in-situ control of the photon emission wavelength and its optical polarization properties. Here, we report on the dynamic control of the optical emission from core-shell GaN/InGaN nanowire (NW) heterostructures using radio frequency surface acoustic waves (SAWs). The SAWs are excited on the surface of a piezoelectric lithium niobate crystal equipped with a SAW delay line onto which the NWs were mechanically transferred. Luminescent quantum dot (QD)-like exciton localization centers induced by compositional fluctuations within the InGaN nanoshell were identified using stroboscopic micro-photoluminescence (micro-PL) spectroscopy. They exhibit narrow and almost fully linearly polarized emission lines in the micro-PL spectra and a pronounced anti-bunching signature of single photon emission in the photon correlation experiments. When the nanowire is perturbed by the propagating SAW, the embedded QD is periodically strained and its excitonic transitions are modulated by the acousto-mechanical coupling, giving rise to a spectral fine-tuning within a ~1.5 meV bandwidth at the acoustic frequency of ~330 MHz. This outcome can be further combined with spectral detection filtering for temporal control of the emitted photons. The effect of the SAW piezoelectric field on the QD charge population and on the optical polarization degree is also observed. The advantage of the acousto-optoelectric over other control schemes is that it allows in-situ manipulation of the optical emission properties over a wide frequency range (up to GHz frequencies).Comment: arXiv admin note: text overlap with arXiv:1902.0791

Software selection based on analysis and forecasting methods, practised in 1C

The research focuses on the problem of a "1C: Enterprise 8" platform inboard mechanisms for data analysis and forecasting. It is important to evaluate and select proper software to develop effective strategies for customer relationship management in terms of sales, as well as implementation and further maintenance of software. Research data allows creating new forecast models to schedule further software distribution

Informational and analytical support of social and labor aspects of an urban settlement

Purpose: The aim of this article is to identify and assess the key problems of the city of Rostov-on-Don in social and labor aspects in order to determine the competitive position of the city relative to the million-plus cities regarding its advantages and key trends. Structure/Methodology/Approach: To realize the goals of strategic planning, it seems appropriate: first, to obtain an analytical assessment of the state of the social and labor sphere of the city of Rostov-on-Don; second, to obtain a comparative assessment of the state relative to the cities of one million Russian citizens; third, to formulate the key problems that have arisen in this field and, fourth, to formulate the competitive position of the city of Rostov-on-Don. Results: To arrange strategic directions for the development of the city of Rostov-on-Don, authors determined the competitive position of the city in the social and labor sphere in the form of advantages, key problems and key trends. Practical implications: The results could be implemented at the municipality level in the formation of the spatial policy of urban development and improving the quality of life of the population. Originality/Value: The main contribution of this study is to implement a system approach to the process of improving and developing information and analytical support for the management of municipal territories.peer-reviewe

Under the influence of new educational technologies: the theory of electrolytic dissociation

The article describes a computer programs for study of the chemistry section, training calculations and knowledge testРассмотрены компьютерные программы для изучения студентами химии, выполнения ими практических заданий и проверки знани

Photoionization of Xe 3d electrons in molecule Xe@C60: interplay of intra-doublet and confinement resonances

We demonstrate rather interesting manifestations of co-existence of resonance features in characteristics of the photoionization of 3d-electrons in Xe@C60. It is shown that the reflection of photoelectrons produced by the 3d Xe photoionization affects greatly partial photoionization cross-sections of and levels and respective angular anisotropy parameters, both dipole and non-dipole adding to all of them additional maximums and minimums. The calculations are performed treating the 3/2 and 5/2 electrons as electrons of different kinds with their spins "up" and "down". The effect of C60 shell is accounted for in the frame of the "orange" skin potential model.Comment: 13 pages, 12 figure

Teaching Academic English to Russian-speaking Academic Staff: The Case of the Office of Academic Writing

The paper discusses the preliminary results of teaching academic writing to scientific and academic staff at South Ural State University (national research university) within the framework of advanced training courses. The 36 and 72-hour training programs were developed by the academic and methodological department of the Office of Academic Writing. The Office was opened at the university in 2016 in order to improve the academic literacy of the university’s academic staff, develop professional communication skills in English, and assist authors who aspire to get their papers published in top rated scientific journals indexed in the scientific citation databases Scopus and Web of Science. Upon completion of these programs, authors of scientific papers gain knowledge about the basics of academic writing, the structure of a scientific paper, the English scientific style and its lexical and grammatical features, as well as editing a paper, working with scientific citation databases, and elaborating a publishing strategy. We conducted a study from October 2016 to December 2018 and calculated data on the attendees’ affiliation (an institute or higher school), the contingent (position), and the importance of the offered training programs (the number of attendees in each course). The obtained data indicates that representatives of social-humanitarian and technical fields show a special interest in the courses. The courses of academic writing are most popular among associate professors who have experience in publishing papers in Russian. Authors are especially interested in intensive practice-oriented programs. Upon completion of the courses and with the support of the Office of Academic Writing, attendees prepared scientific texts in English and submitted them to top rated journals and conference proceedings. The educational activity of the Office of Academic Writing can be developed through elaboration and implementation of new advanced training programs, including the distance ones. Their effectiveness will be evaluated by an increase in the publication activity of the university’s employees