V. Lashkaryov Institute of Semiconductor Physics of National Academy of Sciences of Ukraine

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Department of Theoretical Physics

kochelap
Head of Department
 
Corresponding Member of NAS of Ukraine
Prof. Dr. Sci. Kochelap V.O.
tel.: 525-60-33, 525-55-85
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Staff

  

Deputy Head

Dr. Sci. Korotyeyev V.V.
Senior Researcher
tel.: 525-77-78, 525-60-33
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  Raichev1
 
Dr. Sci. Raichev O.E. 
Leading Researcher
tel.: 525-62-92
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  Strikha
 
Prof. Dr. Sci. Strikha M.V.
Principal Researcher
tel.: 525-62-92
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  Soskin
 
Dr. Sci. Soskin S.M.
Leading Researcher
tel.: 525-62-92 
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Dr. Sci. Pipa V.I.
Leading Researcher
tel.: 525-61-75
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PhD Izmailov I.O.
Senior Researcher
Тел.: 525-77-78
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  Naumov2
 
 
PhD Naumov V.V.
Senior Researcher
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  sokolov
 
PhD Sokolov V.N.
Senior Researcher
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  Kukhtaruk.jpg
 
PhD Kukhtaruk S.M.
Scientific Researcher
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  Linnik 2019
 
PhD Linnik T.L.
Senior Researcher
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PhD Syngayivska G.I.
Scientific Researcher
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yelisieiev.isp.kiev.ua
 
 
PhD Student Yelisieiev M.E.
Junior Researcher
tel.: 525-61-75
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PhD Student Raichev O.O.
Junior Researcher
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Field of research

The main directions of research activity:

Fundamental problems of solid state theory. Analysis of the properties of semiconductors, insulators and quantum heterostructures based on them. The study of phonon and electron subsystems of semiconductors. Study of electron-phonon interaction. Properties of semiconductors, insulators and quantum heterostructures in equilibrium. Fundamental questions of optical semiconductors. The theory of stochastic phenomena.

Problems of kinetics of charge carriers and phonons in semiconductors, micro- and nanostructures. Fundamentals of electron transfer in heterostructures. Electronic transport under the influence of strong electric fields. The theory of hot carriers. Electronic fluctuations. Electronic effects in limited semiconductors (classic size effects).

High-frequency and microwave properties of semiconductors and heterostructures based on them. The interaction of terahertz oscillations with semiconductors. Excitation of terahertz radiation. Generation of coherent phonons of sub-THz and THz range.

Physics of semiconductor devices for nanoelectronics and optoelectronics: heterostructure transistors, resonant tunneling diodes, microwave generators, particularly in the terahertz region of the spectrum, generators of coherent phonons. Development of methods for suppression of electrical noise and fluctuations in micro- and nanostructures.

Achievements

The most significant scientific results:

  • Discovery of additional electromagnetic waves in crystals with spatial dispersion.

  • Development of the theory of electron–phonon interaction in semiconductors (polaron, condenson). Discovery of a new mechanism of electron–phonon interaction proportional to the electric field. Giant amplification of ultrasound. Theory of electronic phase transitions in semiconductors caused by electron–phonon coupling.

  • Development of the theory of spin–orbit interaction in semiconductors and heterostructures and effects based on them.

  • Development of the theory of high-power chemical-pumped lasers. Proposal of gas-dynamic recombination lasers and lasers initiated by shock and detonation waves. Discovery of the formation of optical waveguides in high-pressure reacting systems. Substantiation of a fundamentally new method for obtaining high-density fluxes of singlet oxygen — a dispersed O₂(¹D) generator for high-power chemical lasers.

  • Development of methods for calculating quantum kinetics of electrons and phonons. The kinetic theory of electrons in strong electric fields. Discovery of the effect of multivalued anisotropy of the electrical conductivity in multivalley semiconductors.

  • Discovery of the electron cooling effect in strong electric fields. Identification of mechanisms suppressing various types of electronic fluctuations in spatially confined semiconductor samples. Development of the theory of sub-Poissonian electron statistics in submicron structures with ballistic carrier transport.

  • The theory of linear and nonlinear phenomena in low-dimensional semiconductor heterostructures.

  • Discovery of the formation of self-consistent spatial structures during resonant electron tunneling and at electro-optical effects in quantum structures.

  • Proposals and investigation of new methods for generating terahertz electromagnetic radiation in nanostructures. Discovery of amplification and generation of short-wavelength acoustic phonons in heterostructures and optical phonons in nanoscale structures. Novel plasonic phenomena in nanostructures.

  • Theory of electron-electron interaction in nanostructures.

 

Distinguished scientists

 

   pekar  Solomon Isaakovich Pekar
   rashba
 
   Грибников

 

 

 

Zinovii S. Gribnikov

 
 
 

 

 

LTP project

 

Kochelap Belayev Vadym Serhii Yura
 Prof. V. Kochelap  Prof. O. Bieliaiev  Prof. V. Korotieiev  Dr. S. Kukhtaruk  Dr. Yu. Liashchuk

  

The Polish Academy of Sciences (PAS) and the U.S. National Academy of Sciences (NAS) have selected 18 Ukrainian research teams across various scientific disciplines. One project among them is:

Project title: Device focused research of amplification, generation and control of terahertz radiation

Polish Academy of Sciences – PAN BFB.S.BWZ.367.022.2023 LTP for Ukraine;

Principal Investigator: Prof. V. Kochelap;

Team members: Prof. O. Bieliaiev, Prof. V. Korotieiev, Dr. S. Kukhtaruk, and Dr. Yu. Liashchuk;

Realization: 1 September 2023 – 31 August 2026.

The overall goal of the project is to explore new two-dimensional materials, their heterojunctions, hybrid nanosized systems, and new effects toward plasma-wave electronics and devices for amplification, generation and control of THz radiation.

 

Publications (2025)

1.      V. N. Sokolov and V. A. Kochelap, “Current-driven plasmons in two-layer semiconductor heterostructures: Long-wavelength features and two-stream instability”, Phys. Rev. B 112, 165306 (2025). doi: https://doi.org/10.1103/7vjy-36zl

2.         V. A. Kochelap and M. Yelisieiev, “Charge-fluid heating in quasi-ballistic plasmonic FETs”, Appl. Phys. Lett. 127, 182105 (2025). doi: https://doi.org/10.1063/5.0293820

3.      P. Sai, V. V. Korotyeyev, D. B. But, M. Dub, D. Yavorskiy, J. Łusakowski, M. Słowikowski, S. Kukhtaruk,   Y. Liashchuk, J. W. Han, C. Böttger, A. Pashkin, S. Winnerl, W. Knap, M. Mittendorff, ”Extreme Terahertz Nonlinearity of AlGaN/GaN-Based Grating-Gate Plasmonic Crystals”, Adv. Optical Mater. 2025, 2500716 (2025). doi: https://doi.org/10.1002/adom.202500716

4.      P. Sai, M. Dub, Y. Ivonyak, M. Slowikowski, A. Krajewska, V. Korotyeyev, W. Knap, ”Comparative study of graphene and metal-based grating-gate terahertz plasmonic structures”, J. Appl. Phys. 137, 213103 (2025) doi: https://doi.org/10.1063/5.0273253

 

Conferences: oral presentations (2025)

1.    P. Sai, V. Korotyeyev, J. Woo Han, D. B. But, M. Dub, S. Kukhtaruk, S. Winnerl, W. Knap, M. Mittendorff, "Strong Terahertz Nonlinearity in GaN-Based Two-Dimensional Plasmonic Structures", 2025 International Conference on Mobile and Miniaturized Terahertz Systems (ICMMTS), Dubai, United Arab Emirates, 2025, pp. 1-3, doi: 10.1109/ICMMTS62835.2025.10925975.

2.    P. Sai, V. Korotyeyev, G. Cywiński,M. Dub, S. Rumyantsev, W. Knap"Graphene and GaN-based 2D Plasmonic Nanostructures for THz Filters, Detectors, and Amplifiers", 2025 International Conference on Mobile and Miniaturized Terahertz Systems (ICMMTS), Dubai, United Arab Emirates, 2025, pp. 1-2, doi: 10.1109/ICMMTS62835.2025.10926012.

3.    S. M. Kukhtaruk and V. A. Kochelap“, Amplification of coherent acoustic pulses in the media with excited optical phonons”, Abstracts of X Ukrainian Scientific Conference On Physics Of Semiconductors (USCPS-10), pp. 19-20, Uzhhorod, Ukraine May 26-30, (2025).

4.    V. N. Sokolov and V. A. Kochelap “Peculiarities of long-wavelength plasmons and two-stream instability in double-layer quantum heterostructures”, Abstracts of X Ukrainian Scientific Conference On Physics Of Semiconductors (USCPS-10), pp. 23-24, Uzhhorod, Ukraine May 26-30, (2025).

5.    G. I. Syngayivska, V. V. Korotyeyev, and V. A. Kochelap “Monte Carlo simulation of high-field and high-frequency transport characteristics of 2D electron gas in GaN-based quantum wells”, Abstracts of X Ukrainian Scientific Conference On Physics Of Semiconductors (USCPS-10), pp. 156-157, Uzhhorod, Ukraine May 26-30, (2025).

 

Publications (2024)

1.    S. M. Kukhtaruk and V. A. Kochelap, “Multivalued dispersion equation for coupling between plasmons and surface optical phonons in a graphene/polar-substrate system”, Phys. Rev. B 110, L241403 (2024). doi: https://doi.org/10.1103/PhysRevB.110.L241403

2.    M. Yelisieiev, V. A. Kochelap, “Electron transport in quasi-ballistic FETs subjected to a magnetic field”, AIP Advances 14 (11), 115217 (2024). doi: https://doi.org/10.1063/5.0243812

3.    M. Yelisieiev, V. A. Kochelap, ”Valley-dependent quasi-ballistic electron transport in FETs based on multi-valleys semiconductors”, AIP Advances 14 (7), 075228 (2024). https://doi.org/10.1063/5.0224808

4.    M. Yelisieiev, V. A. Kochelap, “Theory of quasi-ballistic FET: steady-state regime and low-frequency noise”, Semiconductor Science and Technology, 39 (12), 125008 (2024). https://doi.org/10.1088/1361-6641/ad8bed 

 

Conferences: oral presentations (2024)

1.    P. Sai; M. Dub; S. Kukhtaruk; V. Korotyeyev; W. Knap, AlGaN/GaN Grating-Gate Plasmonic Crystals towards Tunable Terahertz Filters and Modulators, 2024 54th European Microwave Conference (EuMC), Paris, France, 2024, pp. 385-388. doi: 10.23919/EuMC61614.2024.10732169 

2.    S. M. Kukhtaruk and V. A. Kochelap, “Initial value problem in the case of multivalued dispersion equations”, Proceedings of Bogolyubov Kyiv Conference ” Problems of Theoretical and Mathematical Physics”, p. 71, 24-26 Sep. (2024).

 

Publications (2023)

1.    P. Sai, M. Dub, V. Korotyeyev, S. Kukhtaruk, G. Cywinski, W. Knap, “THz properties of grating-gate plasmonic crystals”, Lithuanian Journal of Physics 63 (4), 251 (2023). doi:https://doi.org/10.3952/physics.2023.63.4.7 

2.    P. Sai, V. V. Korotyeyev, M. Dub, M. Slowikowski, M. Filipiak, D. B. But, Yu.Ivonyak,M. Sakowicz, Yu.M. Lyaschuk, S. M. Kukhtaruk, G. Cywiñski, and W. Knap, “Electrical Tuning of Terahertz Plasmonic Crystal Phases”, Phys. Rev. X 13, 041003 (2023). https://doi.org/10.1103/PhysRevX.13.041003

 

Conferences: oral presentations (2023)

1.    P. Sai, M. Dub, V. V. Korotyeyev, W. Knap. “Terahertz Grating-Gate Plasmonic Crystals”, 24th International Conference on Applied Electromagnetics and Communications (ICECOM), Dubrovnik, Croatia, 2023, pp. 1-4. doi: 10.1109/ICECOM58258.2023.10367958 

2.    P. Sai, M. Dub, V. V. Korotyeyev, M. Filipiak, M. Slowikowski, Yu. Ivonyak et al., “Different Terahertz Phases of AlGaN/GaN Grating-Gate Plasmonic Crystals”, 48-th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Montreal, QC, Canada, (2023), pp. 1-2. doi: 10.1109/IRMMW-THz57677.2023.10299325 

 

Projects

 

Projects awarded by National Academy of Sciences of Ukraine:

  • 2011-2015, n. III-1-ISP, "Theoretical investigation of electrical, optical and acoustical properties of semiconductor nanostructures and devices of nanoelectronics and nanophotonocs".
  • 2005-2006, Project No 3.25-ISP. Two- and three-terminal devices for contemporary sensor technologies".
  • 2005-2010, n. I-ISP, "Theoretical study of electrical, optical and acoustical properties of semiconductor materials for nanoelectronics and nanophtonocs".
  • 2005-2006, Project No 3.25-ISP. Two- and three-terminal devices for contemporary sensor technologies".
  • 2004-2005, Project No 16.16-ISP. "Investigation of group-III nitride nanostructures for sensor technologies".
  • 2003-2005, 31-ISP. "Theory of electron and optical phenomena in quantum heterostructures based on wide-gap materials".
  • 2002-2004, n. 43-ISP, "Study of coherent phonons and phonon-X-ray interaction in semiconductor nanosamples"
  • 2000-2003, Project of Techno-Park - ISP - n. TP-16, "Elaboration of phonon devices for generators of THz-frequency range for telecommunication applications".
  • 2000-2002, n. 1.3.7/1, "Nonequilibrium electron and phonon phenomena in quantum semiconductor heterostructures".
  • 1995-1999, n. 0195U024516, "Electron and phonon transport in low-dimensional semiconductor structures".
  • 1990-1994, n. 14434/29, "Study of electron properties of semiconductors and their structures. Modeling microelectronic and optoelectronic devices".
  • 1987 - 1991, n. 026057, "Study of nonlinear, collective and coherent effects in materials for microelectronics and optoelectronics".

Projects supported by State Committee on Science and Technology of Ukraine:

  • 1997-2000, n. 2.4/580, "The study of generation of coherent optical phonons under electron transport in semiconductor heterostructures."
  • 1997-2000, n. 2.4/679, "Ampli cation and generation of confi ned and surface acoustic phonons in microstructures and low-dimentional heterostructures"
  • 1994-1996, n. 2.2/49, "Pattern formation in systems with resonant tunneling effect".
  • 1994-1996, n. 2.3/111, "Hot electron lateral transport in quantum heterostructures".
  • 1992-1994, n. 2/130, "Transport, fluctuations and light scattering in hot electron gas of submicron structures, quantum wells and wires".
  • 1993-1994, n. 02/312, "Research and development of means of ampli cation of signals in optical lines for communications".


Other Projects:

  • 2014-2015, CNRS-NANU program, "Generation, detection and modulation of terahertz radiation in plasmonic nanodevices".
  • 2013-2015, BMBF-Ukraine program, "Device Inspiring Research and Technology Demonstration and Assessments for High-Speed and Low-Energy Nanowire Transistors"
  • 2010-2014, Ukrainian nanotechnology program, "Elaboration of technology and investigation amplifi cation/generation of sub-THz and THz emission with the use of semiconductor nanodevices on the base of group-III-nitride compounds".
  • 2010-2014, Ukrainian nanotechnology program, in cooperation with Physics Institute of NANU, "Investigation of high-frequency properties of semiconductor nanostructures with real space  transfer of hot electrons - negative differential conductivity, ampli fication and generation of electromagnetic emission".
  • 2010-2011, CNRS-NANU program, "Ultra-high frequency effects in semiconductor nanostructures and their applications to generation/detection of terahertz radiation".
  • 2005-2007, Project-3922-SCIENCE & TECHNOLOGY CENTER IN UKRAINE. New technologies of THz and sub-THz generation with nanosize semiconductor heterostructures.
  • 2005, ERO (London). USARDSG-SEED-project # N62558-02-M-6381 "SHORT-WAVELENGTH LIGHT-EMITTING DEVICES WITH ENHANCED HOLE INJECTION CURRENTS".
  • 2002-2004, CRDF-10997, "Terahertz Technologies for Microelectronics and Optoelectronics".
  • 2000-2004, NATO Project - SfP 971829 - SILICON TECHNOLOGY: Research and Demonstration of Advanced Silicon PV Technology for Terrestrial Applications in Ukraine"
  • 2000-2001, ERO (London). USARDSG-SEED-project "Phonon technologies for high-speed microelectronics and optoelectronics", Contract N68171-01-M-5166.
  • 1999-2000, NATO-grant, Program in the Priority Area of High Technology: Mechanisms of Noise Suppression in Micro- and Nanoscale Devices.
  • 1993-1994, National Space Agency-project-4-13/93. "Development of new methods and means of ultrasonic treatment of semiconductor materials and devices of microelectronic technique for space applications".

 

Monographs

 

 

Introduction to Optical and Optoelectronic Properties of Nanostructures

Vladimir V. Mitin, Viacheslav A. Kochelap, Mitra Dutta,
Michael A. Stroscio
Cambridge University Press,  2019. - 414 p.
 

  
 

Introduction to Nanoelectronics: Science, Nanotechnology, Engineering, and Applications

Vladimir V. Mitin, Viatcheslav A. Kochelap, Michael A. Stroscio
Cambridge University Press, 2012. - 346 p.
 Vasko2  

Quantum Kinetic Theory and Applications: Electrons, Photons, Phonons

Fedir T. Vasko, Oleg E. Raichev
Springer Science & Business Media, 2006. - 784 p.
 
 Kochelap1999  

Quantum Heterostructures: Microelectronics and Optoelectronics  

Vladimir Mitin, Viacheslav Kochelap, Michael A. Stroscio
Cambridge University Press, 1999. - 642 p.
 Pekar1988  Избранные труды / Пекар С.И.; АН УССР. Ин-т полупроводников
Пекар С.И.
 
Київ : Наук. думка, 1988. – 512 с.
 Pekar1986  

Теория спонтанной и стимулированной хемилюминесценции газов

Кочелап В. А., Пекар С. И.
Київ : Наук. думка, 1986. – 264 с.
   
   
   
   
   
   

 

 

 

Publication

2019