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Spatial and fine energy structure of indirect exciton

The European Physical Journal B 2025年第1期98卷 1-9页

作者： Dzyuba, V. P. Vitrik, O. B. Institute of Automation and Control Processes of FEB RAS Vladivostok Russia

Quantum states of a spatially indirect exciton (IX), including its binding energy, are largely determined by the geometry of the spatial quantum structure consisting of (IX) and the interface (IXI). Unfortunately, this fact has been poorly studied both experimentally and theoretically. In this paper, the parameters of the IXI geometry and their effect on the IX binding energy spectrum are analytically investigated for the first time. For this purpose, the potential of the Coulomb interaction of an electron and a hole is determined using the image method. It is shown that the geometry parameters are quantized, and the effective permittivity of the interface becomes dependent on the orbital and magnetic quantum numbers of IX. A nonlinear dependence of the IX binding energy on the geometric parameters is observed. All these manifestations of the geometry are accessible to experimental observation. Each geometry has its own quantum states. This opens up the possibility of using IXI in exciton spectroscopy of the interface layer. The controllability of the IXI geometry by polarized light allows us to hope for using quantum geometric states of IX as qubits. In this work, various geometric states IX of two planar heterostructures SiO2/Si3N4 and GaAs/CdSe were modeled as an example.

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Plumbene layer grown on Si(111)3×3−B and its restructuring by Mg adsorption

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Physical Review B 2025年第12期111卷 125401-125401页

作者： A. N. Mihalyuk L. V. Bondarenko A. Y. Tupchaya Y. E. Vekovshinin N. V. Denisov D. V. Gruznev A. V. Zotov A. A. Saranin Institute of Automation and Control Processes FEB RAS 690041 Vladivostok Russia Institute of High Technologies and Advanced Materials Far Eastern Federal University 690950 Vladivostok Russia

Using scanning tunneling microscopy observations, the Si(111)3×3−B surface was experimentally proved to be a suitable substrate for hosting high-buckled plumbene. Magnesium (Mg) adsorbed onto the grown plumbene intercalates between the Pb layer and Si(111)3×3−B substrate to form the Pb/Mg/Si(111):B atomic sandwich. Meanwhile, the Pb layer undergoes significant transformations: its original coverage of 2.0 monolayers (ML) reduces to 1.33 ML of Pb, as revealed via the density functional theory (DFT) ab initio random structure search analysis. The layer is arranged in a striped 3×1 structure, which, together with the substrate, adopts the overall 3×3 periodicity. DFT analysis of the band structures of the grown Pb layers revealed that they might possess unique electronic properties. However, the intrinsic properties of the layers appear to be overshadowed by the electronic properties of the real Si(111):B substrate, which underwent a strong subsurface p−type doping. The dominated contribution of the substrate bands to the electronic properties was confirmed in the in situ low-temperature transport measurements, which showed that the Si(111):B substrate with and without plumbene, as well as Pb/Mg/Si(111):B samples, display very similar conductivity values. The obtained results demonstrate that, while considering possible applications, the substrate hosting the prospective low-dimensional structures (e.g., two-dimensional Xenes) must meet not only the structural but also the electronic requirements.

关键词： Scanning tunneling microscopy

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The features of parallel program of computation of unsteady gas flows through a porous media using graphical accelerator 20

The features of parallel program of computation of unsteady ...

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20th Conference Scientific Services and Internet, SSI 2018

作者： Leontev, D.V. Tarasov, G.V. Kharitonov, D.I. Institute of automation and control processes FEB RAS Russia

The questions of development on graphical accelerator (GPU) of an algorithm of modeling an unsteady gas flows through porous media with a sources of chemical combustion are considered. Numerical method for solving considered problem is based on combination of explicit and implicit finite-differences methods (FDM). The developed program’s source code has a classical internal structure, including stage of input data preparing, stage of calculations, and stage of writing final results. By this article the migration attempt of calculation stage on GPU is initiated. It is found that for the considered problem the utilization of both CPU and GPU for computations is not effective through a two reasons. Firstly, there is a data dependency between values of explicit and implicit methods. In concerning this it is no possibility to parallelize methods’ computations on different processors. Secondly, the large overheads on data transmission between CPU memory and GPU memory do not allow performing computations to solve equations and boundary conditions with a high performance. The classical mapping method of kernel threads on computational domain is used for solving explicit FDM. Each kernel thread computes the single cell of computational grid. Block size is matched experimentally for optimal performance values. The implicit FDM is solved using predefined solver from cuSPARSE library specially optimized for GPU. The performance analysis is fulfilled using NVidia Visual Profiler. The evaluation of the performance result is given;the future steps of code modification and performance improvement are described. © 2018 CEUR-WS. All rights reserved.

关键词： Graphics processing unit

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The data processing model of computational experiments 20

The data processing model of computational experiments

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20th Conference Scientific Services and Internet, SSI 2018

作者： Leontev, D.V. Tarasov, G.V. Kharitonov, D.I. Institute of automation and control processes FEB RAS Russia

An approach to construct a data processing models of a computational experiments is considered. To make models the Petri nets are used. The model of computational experiment consists of computational and control processes models. The models are built separately. The computational process model is built in a two stages. On the first stage the user generates the event tree of computational experiment. On the second stage the computational process model is automatically built from the event tree. For the building of the model a template constructions are used, which are composed together. Each element in the event tree has its own template constructions. The model of the control process is built from a reaction patterns. The following three reaction patterns are developed: reaction on a previous event, reaction on each N-th event, reaction on a next event. The reaction pattern is configured on the triggered event. The main feature of the developed approach is that there is no need to reprogram an original computational task. The approach allows users with minimal skills to make the data processing models. The examples of constructing of data processing models are presented. © 2018 CEUR-WS. All rights reserved.

关键词： Petri nets

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Formation control of AUV on the Base of Visual Tracking of AUV-Leader

Formation Control of AUV on the Base of Visual Tracking of A...

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2021 International Russian automation Conference, RusAutoCon 2021

作者： Filaretov, Vladimir Yukhimets, Dmitry Institute of Automation and Control Processes Feb Ras Robotics Laboratory Vladivostok Russia Institute of Marine Technology Problem Feb Ras Institute of Automation and Control Processes Feb Ras Vladivostok Russia

ISBN: (纸本)9780738131566

In this paper, a method for the synthesis of a group control system for AUV moving in the leader-follower mode was proposed. The position of the follower relative to the leader is proposed to be determined using an on-board video camera, which recognized the light beacons installed on the leader's body. The obtained information is used to form an estimate of the position of the target point in the coordinate system of the follower with a frequency sufficient for the implementation of high-precision robust control systems. A method for synthesizing a control system that provides a desired quality of control independently from changes in the parameters of the AUV-follower was proposed. The results of mathematical simulation confirmed the high quality of control provided by the proposed system. © 2021 IEEE.

关键词： Computer vision

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Monitoring and automatic control for heating system of the plant

Monitoring and automatic control for heating system of the p...

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5th FTRA International Conference on Computer Science and its Applications, CSA 2013

作者： Kuznetsov, Roman Chipulis, Valeri Institute of Automation and Control Processes FEB RAS Vladivostok Russia

ISBN: (纸本)9783642416736

The experience of the development, implementation and follow-up operation of information-analytical system on the plant is discussed. Particular attention is paid to the analysis of economic efficiency of heat energy accounting and automatic control of the heating. The possibilities of regression analysis for effective heating control are shown. © 2014 Springer-Verlag Berlin Heidelberg.

关键词： Regression analysis

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Influence of embedded low-dimensional Mg2Si on the conductivity of Si/Mg2Si/Si(111) heterosystems

Influence of embedded low-dimensional Mg2Si on the conductiv...

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International Conference on Physics, Chemistry and Applications of Nanostructures, NANOMEETING 2011

作者： Galkin, K.N. Galkin, N.G. Institute of Automation and Control Processes of FEB RAS Vladivostok Russia

ISBN: (纸本)9789814343893

An increase of the conductivity in the low temperature range has been observed for Si/Mg2Si/Si(111) heterosystems with embedded Mg 2Si nanocrystals (NCs) and/or twodimensional (2D) Mg2Si layer. The models of conductivity processes through the silicon layer with embedded Mg2Si NCs and 2D Mg2Si layer have been *** © 2011 by World Scientific Publishing Co. Pte. Ltd.

关键词： Nanostructures

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Patching holes in the joint set of triangulation grids 25

Patching holes in the joint set of triangulation grids

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25th International Conference on Computer Graphics and Vision, GraphiCon 2015

作者： Kudryashov, A.P. Bobkov, V.A. Institute of Automation and Control Processes FEB RAS Vladivostok Russia

ISBN: (纸本)9785888350416

We present a method for building and texturing a continuous watertight mesh using a hole filling algorithm based on volume diffusion. A multilevel octree-based technique with the weight function being built along both the normal and line of view is proposed. A parallelized computational procedure for a multicore processor is presented which enables significant reduction in computation time. © 2015 institute of Physics and Technology.

关键词： Image reconstruction

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Stability analysis of system with fixed structure controller for industrial multistage separation process via vector Lyapunov function

Stability analysis of system with fixed structure controller...

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作者： Torgashov, A.Yu. Institute for Automation and Control Processes FEB RAS Vladivostok Russia

ISBN: (纸本)9783902661432

The present paper is devoted to the evaluation of stability analysis of multi-stage separation process (multicomponent distillation) control system based on the tray-by-tray nonlinear dynamic process model. The vector Lyapunov function (LF) jointly with comparison functions (CF) are proposed for the stated problem solution. The overall system of differential equations is decomposed on the subsystems so that the LF for each subsystem can be determined. It was shown that the unforced subsystems of distillation model are unstable. But the stabilizing effect of composite system is reached in a natural way by the interaction among these subsystems. This gives the possibility to formulate stability conditions using CF. The estimation of stability domain for multivariable fixed-structure composition (temperature) controller for two-product industrial distillation column is given as illustrative example. © 2009 IFAC.

关键词： Lyapunov functions

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Mathematical Models and Algorithms of the Onboard Multiposition Integrated Inertial-Satellite Motion Detection System 30

Mathematical Models and Algorithms of the Onboard Multiposit...

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30th Saint Petersburg International Conference on Integrated Navigation Systems, ICINS 2023

作者： Shurygin, A.V. Institute of Automation and Control Processes FEB RAS Vladivostok Russia

ISBN: (纸本)9785919950950

The report outlines the problems of assimilation of navigation information delivered by spaced on-board sensors for satellite positioning of a moving object (technological platform) combined with three-component specific force vector meters (3D newtonometers). The main mathematical constructions follow the "state-measurement"paradigm and are focused on solving the inverse problems of determining the movement of technological platform as a solid body. An ellipsoidal system and other coordinate systems that determine solutions are selected as the base coordinate system. Algorithms for calculating kinematic parameters and spatial orientation of technological platform, characteristics of motion causality-forces and moments are presented. A numerical solution to the problem of vector gravimetry is proposed. An original digital test stand of the system for assimilating integrated satellite and inertial navigation information has been developed. © 2023 Concern CSRI Elektropribor, JSC.

关键词： Inverse problems

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