Выполнен цикл экспериментальных исследований, а именно, проведены измерения и выполнен анализ полевых зависимостей статической магнитной восприимчивости в образцах тонких пленок монокристаллического SiC, выращенных на поверхностях (100), (110) и (111) монокристаллического Si методом согласованного замещения атомов за счет химической реакции Si с газом CO. В результате исследований в структурах SiC, выращенных на Si (110) и Si (111), обнаружено возникновение в слабых магнитных полях двух квантовых эффектов при комнатной температуре. Этими эффектами являются, во-первых, образование гистерезиса статической магнитной восприимчивости, а во-вторых, возникновение осцилляций Ааронова--Бома в полевых зависимостях статической магнитной восприимчивости. Первый эффект связывается нами с эффектом Мейснера--Оксенфельда, а второй --- с присутствием в данных структурах под слоем SiC микродефектов в виде нанотрубок и микропор, формирующихся в процессе синтеза структур. В структурах SiC, выращенных на Si (100), эти эффекты обнаружены не были, что связывается нами с иным механизмом образования SiC на поверхности (100) Si. Ключевые слова: карбид кремния на кремнии, дилатационные диполи, магнитная восприимчивость, диамагнетизм, эффект Ааронова--Бома.
Measurements of the field dependences of the static magnetic susceptibility demonstrate de Haas-Van Alphen and Aharonov-Bohm oscillations at high temperatures and low magnetic fields in silicon nanosandwich structures (SNS). In the case of the deposition of DNA oligonucleotides into the edge channels of the SNS, a change in the oscillation period is observed. The possibilities of using the obtained data to identify the properties of DNA oligonucleotides are discussed.
For the first time, electroluminescence was discovered in the middle and far infrared ranges from silicon carbide nanostructures on silicon, obtained in the framework of the Hall geometry. Silicon carbide on silicon was grown by the method of substitution of atoms on silicon. The electroluminescence from the edge channels of nanostructures is induced due to the longitudinal drain- source current. The electroluminescence spectra obtained in the terahertz frequency range, 3.4, 0.12 THz, arise due to the quantum Faraday effect. Within the framework of the proposed model, the longitudinal current induces a change in the number of magnetic flux quanta in the edge channels, which leads to the appearance of a generation current in the edge channel and, accordingly, to terahertz radiation.
A spectrometer based on silicon nanosandwiches (SNS) is proposed for solving problems of personalized medicine. Silicon nanosandwich (SNS) structures combine the properties of a terahertz (THz) emitter and a recorder of THz response from biological tissue. It has been demonstrated that recording the current-voltage characteristics (CVC) of the SNS structure allows us to analyze the spectral composition of the THz response from biological tissue and thus determine the relative contribution of various proteins and amino acids that make up the DNA oligonucleotides and their compounds. At the same time, the obvious advantages of the proposed technique are visible, since the THz response can be detected directly from living biological tissue, which can form the basis for the rapid analysis of DNA oligonucleotides. Further study of the behavior of the spectral peaks of the SNS C – V characteristics is of great interest for methods of personalized diagnosis and treatment, as demonstrated by the example of testing various control groups of subjects.
A spectrometer based on silicon nanosandwiches has been proposed to detect complications caused by COVID-19. Operating in the mode of a balanced photodetector, the silicon nanosandwich is both a source of terahertz irradiation and a receiver of reflected and/or radiated from biological tissue. It has been demonstrated that recording the current-voltage characteristics of a silicon nanosandwich made it possible to analyze changes in the thyroid gland, thereby determining the degree and nature of changes caused by the COVID-19 disease.
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