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Tailoring spontaneous infrared emission of HgTe quantum dots with laser-printed plasmonic arrays

Light(Science & Applications) 2020年第1期9卷 1870-1879页

作者： a.a.sergeev D.V.Pavlov A.A.Kuchmizhak M.V.Lapine W.K.Yiu Y.Dong N.Ke S.Juodkazis N.Zhao S.V.Kershaw A.L.Rogach Institute of Automation and Control Processes Far Eastern BranchRussian Academy of SciencesVladivostok 690041Russia Far Eastern Federal University Vladivostok 690090Russia University of Technology Sydney NSW 2007 SydneyAustralia Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongKowloonHong Kong SARChina Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Material Science and ChemistryChina University of GeosciencesWuhan 430074China Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina Swinburne University of Technology John St.HawthornVIC 3122Australia Melbourne Centre for Nanofabrication ANFF151 Wellington RoadClaytonVIC 3168Australia

Chemically synthesized near-infrared to mid-infrared(IR)colloidal quantum dots(QDs)offer a promising platform for the realization of devices including emitters,detectors,security,and sensor ***,at longer wavelengths,the quantum yield of such QDs decreases as the radiative emission rate drops following Fermi’s golden rule,while non-radiative recombination channels compete with light *** over the radiative and non-radiative channels of the IR-emitting QDs is crucially important to improve the performance of IR-range ***,we demonstrate strong enhancement of the spontaneous emission rate of near-to mid-IR HgTe QDs coupled to periodically arranged plasmonic nanoantennas,in the form of nanobumps,produced on the surface of glasssupported Au films via ablation-free direct femtosecond laser *** enhancement is achieved by simultaneous radiative coupling of the emission that spectrally matches the first-order lattice resonance of the arrays,as well as more efficient photoluminescence excitation provided by coupling of the pump radiation to the local surface plasmon resonances of the isolated ***,coupling of the HgTe QDs to the lattice plasmons reduces the influence of non-radiative decay losses mediated by the formation of polarons formed between QD surface-trapped carriers and the IR absorption bands of dodecanethiol used as a ligand on the QDs,allowing us to improve the shape of the emission spectrum through a reduction in the spectral dip related to this ligand *** the ease of the chemical synthesis and processing of the HgTe QDs combined with the scalability of the direct laser fabrication of nanoantennas with tailored plasmonic responses,our results provide an important step towards the design of IR-range devices for various applications.

关键词： quantum radiative coupling

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Seiberg-Witten theory as a complex version of Abelian Higgs model

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Science China Mathematics 2017年第6期60卷 1089-1100页

作者： sergeev Armen Steklov Mathematical Institute Moscow 100001 Russia

The adiabatic limit procedure associates with every solution of Abelian Higgs model in （2 ^- 1） dimensions a geodesic in the moduli space of static solutions. We show that the same procedure for Seiberg- Witten equations on 4-dimensional symplectic manifolds introduced by Taubes may be considered as a complex （2＋2）-dimensional version of the （2＋ 1）-dimensional picture. More precisely, the adiabatic limit procedure in the 4-dimensional case associates with a solution of Seiberg-Witten equations a pseudoholomorphic divisor which may be treated as a complex version of a geodesic in （2＋l）-dimensional case.

关键词： Ginzburg-Landau equations vortices Seiberg-Witten equations

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Twistor quantization of the space of half-differentiable vector functions on the circle revisited

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Science China Mathematics 2009年第12期52卷 2714-2729页

作者： sergeev Armen Department of Mathematical Physics Steklov Mathematical InstituteMoscow 119991Russia

We discuss the twistor quantization problem for the classical system (V d ,A d ), represented by the phase space V d , identified with the Sobolev space H 0 1/2 (S 1,? d ) of half-differentiable vector functions on the circle, and the algebra of observables A d , identified with the semi-direct product of the Heisenberg algebra of V d and the algebra Vect(S 1) of tangent vector fields on the circle.

关键词： twistor quantization Sobolev space of half-differentiable functions group of diffeomorphisms of the circle 58E20 53C28 32L25

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Adiabatic paths and pseudoholomorphic curves

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Science China Mathematics 2005年第z1期48卷 168-179页

作者： Armen G.sergeev Steklov Mathematical Institute Gubkina 8 Moscow119991GSP-1Russia

We consider the (2+1)-dimensional Abelian Higgs model, governed by the Ginzburg-Landau action functional and describe the adiabatic limit construction for this model. Then we switch to the 4-dimensional case and Show that the Taubes correspondence may be considered as a (2+2)-dimensional analogue of the adiabatic limit construction.

关键词： adiabatic path, Ginzburg-Landau equation, Seiberg-Witten equation.

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Harmonic maps into loop spaces eliminate of compact Lie groups

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Science China Mathematics 2008年第4期51卷 695-706页

作者： Armen Glebovich sergeev Steklov Mathematical Institute

We study harmonic maps from Riemann surfaces M to the loop spacesΩG of compact Lie groups G,using the twistor *** conjecture that harmonic maps of the Riemann sphere CP^1 intoΩG are related to Yang-Mills G-fields on... 详细信息

关键词： harmonic maps Yang-Mills fields twistor bundles

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On Mathematical Aspects of the Theory of Topological Insulators

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Acta Mathematica Sinica,English Series 2024年第1期40卷 81-106页

作者： Innocenti MARESIN Armen sergeev Egor TEPLYAKOV Department of Complex Analysis Steklov Mathematical Institute119991Gubkina 8MoscowRussia Moscow Institute of Physics and Technology 141701Institute per.9DolgoprudnyMoscow RegionRussia

This review is devoted to one of the most interesting and actively developing fields in condensed matter physics—theory of topological *** from its importance for theoretical physics,this theory enjoys numerous connections with modern mathematics,in particular,with topology and homotopy theory,Clifford algebras,K-theory and non-commutative *** the physical point of view topological invariance is equivalent to adiabatic *** insulators are characterized by the broad energy gap,stable under small deformations,which motivates application of topological methods.A key role in the study of topological ob jects in the solid state physics is played by their symmetry *** are three main types of symmetries—time reversion symmetry,preservation of the number of particles(charge symmetry)and PH-symmetry(particle-hole symmetry).Based on the study of symmetry groups and representation theory of Clifford algebras Kitaev proposed a classification of topological ob jects in solid state *** this review we pay special attention to the topological insulators invariant under time reversion.

关键词： Topological insulators Bloch theory fermionic Fock spaces Kramers degeneration Maiorana states

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Invariance of specific mass increment in the case of non-equilibrium growth

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Chinese Physics B 2015年第9期24卷 139-141页

作者： L.M.Martyushev A.P.sergeev P.S.Terentiev Ural Federal University Institute of Industrial Ecology

The invariance of specific mass increments of crystalline structures that co-exist in the case of non-equilibrium growth is grounded for the first time by using the maximum entropy production principle. Based on the hypothesis of the existence of a universal growth equation, and through the dimensional analysis, an explicit form of the time-dependent specific mass increment is proposed. The applicability of the obtained results for describing growth in animate nature is discussed.

关键词： entropy production universal growth equation

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Compressor and Turbine Multidisciplinary Design for Highly Efficient Micro-gas Turbine

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Journal of Thermal Science 2018年第3期27卷 259-269页

作者： BARSI Dario PERRONE ANDrea QU Yonglei RATTO Luca RICCI Gianluca sergeev Vitaliy ZUNINO Pietro Department of Mechanical Energy Management and Transport Engineering Università degli Studi di Genova Faculty of Power and Energy Engineering Harbin Engineering University Institute of Energy and Transport Systems "Peter the Great" St. Petersburg Polytechnic University

Multidisciplinary design optimization （MDO） is widely employed to enhance turbomachinery compo- nents efficiency. The aim of this work is to describe a complete tool for the aero-mechanical design of a radial in- flow turbine and a centrifugal compressor. The high rotational speed of such machines and the high exhaust gas temperature （only for the turbine） expose blades to really high stresses and therefore the aerodynamics design has to be coupled with the mechanical one through an integrated procedure. The described approach employs a fuUy 3D Reynolds Averaged Navier-Stokes （RANS） solver for the aerodynamics and an open source Finite Element Analysis （FEA） solver for the mechanical integrity assessment. Due to the high computational cost of both these two solvers, a meta model, such as an artificial neural network （ANN）, is used to speed up the optimization design process. The interaction between two codes, the mesh genera- tion and the post processing of the results are achieved via in-house developed scripting modules. The obtained results are widely presented and discussed.

关键词： Micro-gas turbine Multidisciplinary Optimization Centrifugal Compressor Centripetal Turbine

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Complex analysis of the damage caused by geocryologic processes (as exemplified by effects on the Chara-China Railway track, Transbaikal region)

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Research in Cold and Arid Regions 2017年第3期9卷 335-338页

作者： Irina Chesnokova Dmitry sergeev Water Problems Institute Russian Academy of Sciences Institute of Environmental Geoscience Russian Academy of Sciences

The report presents an analysis of a unique data set demonstrating the influence of geocryological processes on the 75-km Chara-China Railway track(northern Transbaikal region).The originality of these investigations lies in the study of the influence of natural processes on the road in the absence of any repair works or protective and compensating measures for a long period of time(1998~2014).These conditions allowed assessment of the actual damage to the railroad.

关键词： geocryological processes permafrost conditions social-economic damage Chara-China Railway track

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Machine learning prediction of methane,ethane,and propane solubility in pure water and electrolyte solutions:Implications for stray gas migration modeling

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Acta Geochimica 2024年第5期43卷 971-984页

作者： Ghazal Kooti Reza Taherdangkoo Chaofan Chen Nikita sergeev Faramarz Doulati Ardejani Tao Meng Christoph Butscher Institute of Geotechnics TU Bergakademie FreibergGustav-Zeuner-Str.109599 FreibergGermany Department of Petroleum Engineering Amirkabir University of TechnologyTehranIran Freiberg Center for Water Research ZeWaF TU Bergakademie Freiberg09599 FreibergGermany School of Mining College of EngineeringUniversity of TehranTehranIran Taiyuan University of Science and Technology Taiyuan 030024China

Hydraulic fracturing is an effective technology for hydrocarbon extraction from unconventional shale and tight gas reservoirs.A potential risk of hydraulic fracturing is the upward migration of stray gas from the deep subsurface to shallow *** stray gas can dissolve in groundwater leading to chemical and biological reactions,which could negatively affect groundwater quality and contribute to atmospheric *** knowledge oflight hydrocarbon solubility in the aqueous environment is essential for the numerical modelling offlow and transport in the ***,we compiled a database containing 2129experimental data of methane,ethane,and propane solubility in pure water and various electrolyte solutions over wide ranges of operating temperature and *** machine learning algorithms,namely regression tree(RT)and boosted regression tree(BRT)tuned with a Bayesian optimization algorithm(BO)were employed to determine the solubility of *** predictions were compared with the experimental data as well as four well-established thermodynamic *** analysis shows that the BRT-BO is sufficiently accurate,and the predicted values agree well with those obtained from the thermodynamic *** coefficient of determination(R2)between experimental and predicted values is 0.99 and the mean squared error(MSE)is 9.97×10^(-8).The leverage statistical approach further confirmed the validity of the model developed.

关键词： Gas solubility Hydraulic fracturing Thermodynamic models Regression tree Boosted regression tree Groundwater contamination

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