Hao Chu, Sergey Kovalev, Zi Xiao Wang, Lukas Schwarz, Tao Dong, Liwen Feng, Rafael Haenel, Minjae Kim, Parmida Shabestari, Le Phuong Hoang, Kedar Honasoge, Robert David Dawson, Daniel Putzky, Gideok Kim, Matteo Puviani, Min Chen, Nilesh Awari, Alexey Ponomaryov, Igor Ilyakov, Martin Bluschke, Fabio Boschini, Marta Zonno, Sergey Zhdanovich, MengXing Na, G. Christiani, Г. Логвенов, David J. Jones, A. Damascelli, M. Minola, B. Keimer, Dirk Manske, Nanlin Wang, Jan‐Christoph Deinert, S. Kaiser,
Abstract Cuprate high- T c superconductors are known for their intertwined interactions and the coexistence of competing orders. Uncovering experimental signatures of these interactions is often the first step in understanding their complex relations. A typical spectroscopic signature of the interaction between a discrete mode and a continuum of excitations is the Fano resonance/interference, characterized by the asymmetric light-scattering amplitude of the discrete mode as a function of the electromagnetic ...
Tópico(s): Quantum and electron transport phenomena
2023 - Nature Portfolio | Nature Communications
Irina Kasianova, Ellina Kharatyian, А. Р. Гейвандов, S. P. Palto,
... film Acknowledgements The authors are grateful to Dr Igor Ponomaryov (A. N. Nesmeyanov Institute of Organoelement Compounds of ...
Tópico(s): Photonic Crystals and Applications
2010 - Taylor & Francis | Liquid Crystals
Liwen Feng, Jiayuan Cao, Tim Priessnitz, Yunyun Dai, Thales de Oliveira, Jiayu Yuan, Ryosuke Oka, Minjae Kim, Min Chen, Alexey Ponomaryov, Igor Ilyakov, Haotian Zhang, Yongbo Lv, V. Mazzotti, Gideok Kim, G. Christiani, Г. Логвенов, Dong Wu, Yuan Huang, Jan‐Christoph Deinert, Sergey Kovalev, S. Kaiser, Tao Dong, Nanlin Wang, Hao Chu,
$2H\text{-NbS}{\mathrm{e}}_{2}$ is an archetypal system in which superconductivity and charge density wave (CDW) coexist and compete macroscopically with each other. In particular, this interplay also manifests in their dynamical fluctuations. As a result, the superconducting amplitude fluctuation (i.e., Higgs mode) is pushed below the quasiparticle continuum, allowing it to become a coherent excitation observable by Raman scattering. In the present study, we coherently drive the collective oscillations ...
Tópico(s): Iron-based superconductors research
2023 - American Physical Society | Physical review. B./Physical review. B
Klaas‐Jan Tielrooij, Alessandro Principi, David Saleta Reig, Alexander Block, Sebin Varghese, S. Schreyeck, Karl Brünner, G. Karczewski, Igor Ilyakov, Oleksiy Ponomaryov, Thales V. A. G. de Oliveira, Min Chen, Jan‐Christoph Deinert, Carmen Gomez Carbonell, Sergio O. Valenzuela, L. W. Molenkamp, T. Kießling, G. V. Astakhov, Sergey Kovalev,
Achieving efficient, high-power harmonic generation in the terahertz spectral domain has technological applications, for example in sixth generation (6G) communication networks. Massless Dirac fermions possess extremely large terahertz nonlinear susceptibilities and harmonic conversion efficiencies. However, the observed maximum generated harmonic power is limited, because of saturation effects at increasing incident powers, as shown recently for graphene. Here, we demonstrate room-temperature terahertz ...
Tópico(s): Terahertz technology and applications
2022 - Springer Nature | Light Science & Applications
Pavlo Makushko, Sergey Kovalev, Yevhen Zabila, Igor Ilyakov, Alexey Ponomaryov, Atiqa Arshad, Gulloo Lal Prajapati, Thales V. A. G. de Oliveira, Jan‐Christoph Deinert, Paul Chekhonin, Igor Veremchuk, Tobias Kosub, Y. Skourski, Fabian Ganss, Denys Makarov, Carmine Ortix,
Tópico(s): Physics of Superconductivity and Magnetism
2024 - Nature Portfolio | Nature Electronics
Volodymyr Ponomaryov, Alberto Rosales, Francisco J. Gallegos‐Funes, Igor Loboda,
We present a novel algorithm that can suppress impulsive noise in video colour sequences. It uses order statistics, and directional and adaptive processing techniques.
Tópico(s): Neural Networks and Applications
2007 - Institute of Electronics, Information and Communication Engineers | IEICE Transactions on Communications
Igor Loboda, Yakov Feldshteyn, Volodymyr Ponomaryov,
Efficiency of gas turbine condition monitoring systems depends on quality of diagnostic analysis at all its stages such as feature extraction (from raw input data), fault detection, fault identification, and prognosis. Fault identification algorithms based on the gas path analysis may be considered as an important and sophisticated component of these systems. These algorithms widely use pattern recognition techniques, mostly different artificial neural networks. In order to choose the best technique, ...
Tópico(s): Fault Detection and Control Systems
2012 - De Gruyter | International Journal of Turbo and Jet Engines
Sergey Kovalev, Klaas‐Jan Tielrooij, Jan‐Christoph Deinert, Igor Ilyakov, Nilesh Awari, Min Chen, Alexey Ponomaryov, Mohammed Bawatna, Thales V. A. G. de Oliveira, Lukas M. Eng, К. А. Кузнецов, D. A. Safronenkov, G. Kh. Kitaeva, П. И. Кузнецов, Hassan A. Hafez, Dmitry Turchinovich, Michael Gensch,
Abstract Topologically protected surface states present rich physics and promising spintronic, optoelectronic, and photonic applications that require a proper understanding of their ultrafast carrier dynamics. Here, we investigate these dynamics in topological insulators (TIs) of the bismuth and antimony chalcogenide family, where we isolate the response of Dirac fermions at the surface from the response of bulk carriers by combining photoexcitation with below-bandgap terahertz (THz) photons and TI ...
Tópico(s): Quantum Mechanics and Non-Hermitian Physics
2021 - Nature Portfolio | npj Quantum Materials
Igor Ilyakov, Alexey Ponomaryov, David Saleta Reig, Conor Murphy, Jake D. Mehew, Thales V. A. G. de Oliveira, Gulloo Lal Prajapati, Atiqa Arshad, Jan‐Christoph Deinert, Monica F. Craciun, Saverio Russo, Sergey Kovalev, Klaas‐Jan Tielrooij,
Several technologies, including photodetection, imaging, and data communication, could greatly benefit from the availability of fast and controllable conversion of terahertz (THz) light to visible light. Here, we demonstrate that the exceptional properties and dynamics of electronic heat in graphene allow for a THz-to-visible conversion, which is switchable at a sub-nanosecond time scale. We show a tunable on/off ratio of more than 30 for the emitted visible light, achieved through electrical gating ...
Tópico(s): Strong Light-Matter Interactions
2023 - American Chemical Society | Nano Letters
Sergey V. Lindeman, Igor I. Ponomaryov, Nikolai I. Raevsky, Yurii T. Struchkov, A. L. Rusanov,
Abstract The X‐ray structural investigation of the naphthoylenebis‐(benzimidazole) ( 1 ) cis ‐ and trans ‐isomers as models for the cis and trans elementary units of the corresponding poly(naphthoylene‐benzimidazoles) (PNBI) was carried out. The correctness of the previous identification of the isomers was confirmed, and exact geometrical parameters of the PNBI elementary units (required, in particular, for the calculation of the Kuhn segment of PNBI) were determined. Quantum‐chemical semi‐empirical calculations ...
Tópico(s): Structural and Chemical Analysis of Organic and Inorganic Compounds
1994 - Wiley | Macromolecular Chemistry and Physics
Jan‐Christoph Deinert, David Alcaraz Iranzo, R. Pérez, Xiaoyu Jia, Hassan A. Hafez, Igor Ilyakov, Nilesh Awari, Min Chen, Mohammed Bawatna, Alexey Ponomaryov, Semyon Germanskiy, Mischa Bonn, Frank H. L. Koppens, Dmitry Turchinovich, Michael Gensch, Sergey Kovalev, Klaas‐Jan Tielrooij,
Nonlinear optics is an increasingly important field for scientific and technological applications, owing to its relevance and potential for optical and optoelectronic technologies. Currently, there is an active search for suitable nonlinear material systems with efficient conversion and a small material footprint. Ideally, the material system should allow for chip integration and room-temperature operation. Two-dimensional materials are highly interesting in this regard. Particularly promising is ...
Tópico(s): Metamaterials and Metasurfaces Applications
2020 - American Chemical Society | ACS Nano
Fanqi Meng, Frederik Walla, Sergey Kovalev, Jan‐Christoph Deinert, Igor Ilyakov, Min Chen, Alexey Ponomaryov, S. G. Pavlov, Heinz‐Wilhelm Hübers, N. V. Abrosimov, Christoph Jungemann, Hartmut G. Roskos, Mark D. Thomson,
We investigate ultrafast harmonic generation (HG) in Si:B, driven by intense pump pulses with fields reaching $\ensuremath{\sim}100\phantom{\rule{0.28em}{0ex}}\mathrm{kV}\phantom{\rule{0.16em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$ and a carrier frequency of 300 GHz, at 4 K and 300 K, both experimentally and theoretically. We report several findings concerning the nonlinear charge carrier dynamics in intense sub-THz fields: (i) Harmonics of order up to $n=9$ are observed at room temperature, while at ...
Tópico(s): Advanced Fiber Laser Technologies
2023 - American Physical Society | Physical Review Research
Ruslan Salikhov, Igor Ilyakov, Lukas Körber, Attila Kákay, R. A. Gallardo, Alexey Ponomaryov, Jan‐Christoph Deinert, Thales V. A. G. de Oliveira, K. Lenz, J. Faßbender, Stefano Bonetti, Olav Hellwig, J. Lindner, Sergey Kovalev,
Abstract Spin-based technologies can operate at terahertz frequencies but require manipulation techniques that work at ultrafast timescales to become practical. For instance, devices based on spin waves, also known as magnons, require efficient generation of high-energy exchange spin waves at nanometre wavelengths. To achieve this, a substantial coupling is needed between the magnon modes and an electro-magnetic stimulus such as a coherent terahertz field pulse. However, it has been difficult to ...
Tópico(s): Physics of Superconductivity and Magnetism
2023 - Nature Portfolio | Nature Physics
Igor Ilyakov, Arne Brataas, Thales V. A. G. de Oliveira, Alexey Ponomaryov, Jan‐Christoph Deinert, Olav Hellwig, J. Faßbender, J. Lindner, Ruslan Salikhov, Sergey Kovalev,
Abstract Efficient generation and control of spin currents launched by terahertz (THz) radiation with subsequent ultrafast spin-to-charge conversion is the current challenge for the next generation of high-speed communication and data processing units. Here, we demonstrate that THz light can efficiently drive coherent angular momentum transfer in nanometer-thick ferromagnet/heavy-metal heterostructures. This process is non-resonant and does neither require external magnetic fields nor cryogenics. ...
Tópico(s): Topological Materials and Phenomena
2023 - Nature Portfolio | Nature Communications
Min-Jae Kim, Sergey Kovalev, Mattia Udina, Rafael Haenel, Gideok Kim, Matteo Puviani, Georg Cristiani, Igor Ilyakov, Thales V. A. G. de Oliveira, Alexey Ponomaryov, Jan‐Christoph Deinert, Г. Логвенов, B. Keimer, Dirk Manske, Lara Benfatto, S. Kaiser,
Ultrafast optical control of quantum systems is an emerging field of physics. In particular, the possibility of light-driven superconductivity has attracted much of attention. To identify nonequilibrium superconductivity, it is necessary to measure fingerprints of superconductivity on ultrafast timescales. Recently, nonlinear THz third-harmonic generation (THG) was shown to directly probe the collective degrees of freedoms of the superconducting condensate, including the Higgs mode. Here, we extend ...
Tópico(s): Superconducting and THz Device Technology
2024 - American Association for the Advancement of Science | Science Advances
Igor Ilyakov, Alexey Ponomaryov, J. Michael Klopf, Alexej Pashkin, Jan‐Christoph Deinert, Thales V. A. G. de Oliveira, P. Evtushenko, M. Helm, Stephan Winnerl, Sergey Kovalev,
Radiation sources with a stable carrier-envelope phase (CEP) are highly demanded tools for field-resolved studies of light-matter interaction, providing access both to the amplitude and phase information of dynamical processes. At the same time, many coherent light sources, including those with outstanding power and spectral characteristics lack CEP stability, and so far could not be used for this type of research. In this work, we present a method enabling linear and non-linear phase-resolved terahertz ( ...
Tópico(s): Spectroscopy and Laser Applications
2022 - Optica Publishing Group | Optics Express
Hans Igor Lopez Chavez, V. Gonzalez, Antonio Cedillo‐Hernandez, Volodymyr Ponomaryov,
This paper focuses on a novel image resolution enhancement method employing the wavelet domain techniques and hardware implementation of designed framework. In novel resolution enhancement approach for better preservation of the edge features, additional edge extraction step is used employing high-frequency (HF) sub-band images - low-high (LH), high-low (HL), and high-high (HH) - via the Discrete Wavelet Transform (DWT). In the designed procedure, the low resolution (LR) image is used in the sparse interpolation ...
Tópico(s): Sparse and Compressive Sensing Techniques
2014 - Springer Science+Business Media | Lecture notes in computer science
Volodymyr Ponomaryov, Francisco J. Gallegos‐Funes, Alberto Rosales, Igor Loboda,
We present novel algorithms to suppress impulsive noise in video color sequences. They use order statistics, directional and adaptive processing techniques. Extensive simulation results in known reference video color sequences have demonstrated that the proposed filters consistently outperform other filters by balancing the tradeoff between noise suppression, detail preservation, and chromaticity characteristics. The criteria used to compare the performance or various filters were the PSNR, MAE, ...
Tópico(s): Speech and Audio Processing
2006 - Springer Science+Business Media | Lecture notes in computer science
Atiqa Arshad, Hatice Nur Koyun, Ruslan Salikhov, Michael Gensch, Igor Ilyakov, Alexey Ponomaryov, Gulloo Lal Prajapati, Thales V. A. G. de Oliveira, Kalliopi Mavridou, J. Lindner, Jan‐Christoph Deinert, Cumhur Gökhan Ünlü, Sergey Kovalev,
The third harmonic generation (THG) of graphite layers on paper substrate upon excitation with intense (up to 100 kV cm −1 ) narrowband terahertz (THz) pulses is studied. Highest THG efficiencies are comparable with those of chemical vapor deposition‐grown single‐layer graphene. Samples are hand drawn, using commercially available pencils. The THG response shows high sensitivity regarding the hatching direction relative to the THz polarization orientation. Using Raman spectroscopy, the occurrence of graphene‐ ...
Tópico(s): Superconducting and THz Device Technology
2023 - Wiley | Advanced Photonics Research
T. Metzger, K. A. Grishunin, Chris Reinhoffer, R. M. Dubrovin, Atiqa Arshad, Igor Ilyakov, Thales V. A. G. de Oliveira, Alexey Ponomaryov, Jan‐Christoph Deinert, Sergey Kovalev, R. V. Pisarev, M. I. Katsnelson, B. A. Ivanov, P. H. M. van Loosdrecht, A. V. Kimel, E. A. Mashkovich,
Abstract Understanding spin-lattice interactions in antiferromagnets is a critical element of the fields of antiferromagnetic spintronics and magnonics. Recently, coherent nonlinear phonon dynamics mediated by a magnon state were discovered in an antiferromagnet. Here, we suggest that a strongly coupled two-magnon-one phonon state in this prototypical system opens a novel pathway to coherently control magnon-phonon dynamics. Utilizing intense narrow-band terahertz (THz) pulses and tunable magnetic ...
Tópico(s): Rare-earth and actinide compounds
2024 - Nature Portfolio | Nature Communications
Yongzheng Wen, F. Giorgianni, Igor Ilyakov, Baogang Quan, Sergey Kovalev, Chen Wang, C. Vicario, Jan‐Christoph Deinert, Xiaoyu Xiong, Joe Bailey, Min Chen, Alexey Ponomaryov, Nilesh Awari, Andrea Rovere, Jingbo Sun, Roberto Morandotti, Luca Razzari, G. Aeppli, Junjie Li, Ji Zhou,
Non-linear materials are cornerstones of modern optics and electronics. Strong dependence on the intrinsic properties of particular materials, however, inhibits the at-will extension of demanding non-linear effects, especially those second-order ones, to widely adopted centrosymmetric materials (for example, silicon) and technologically important burgeoning spectral domains (for example, terahertz frequencies). Here we introduce a universal route to efficient non-linear responses enabled by exciting ...
Tópico(s): Photonic and Optical Devices
2023 - Oxford University Press | National Science Review
Min Chen, Thales V. A. G. de Oliveira, Igor Ilyakov, Tobias Nörenberg, Frederik Kuschewski, Jan‐Christoph Deinert, Nilesh Awari, Alexey Ponomaryov, Michael Kuntzsch, Susanne C. Kehr, Lukas M. Eng, Michael Gensch, Sergey Kovalev,
A conceptually new approach to synchronizing accelerator-based light sources and external laser systems is presented. The concept is based on utilizing a sufficiently intense accelerator-based single-cycle terahertz pulse to slice a thereby intrinsically synchronized femtosecond-level part of a longer picosecond laser pulse in an electro-optic crystal. A precise synchronization of the order of 10 fs is demonstrated, allowing for real-time lock-in amplifier signal demodulation. We demonstrate successful ...
Tópico(s): Semiconductor Quantum Structures and Devices
2022 - Optica Publishing Group | Optics Express
Alexey Ponomaryov, Jan‐Christoph Deinert, Thales V. A. G. de Oliveira, Igor Ilyakov, Gulloo Lal Prajapati, Atiqa Arshad, Michael Kuntzsch, Michael Gensch, Sergey Kovalev,
In this paper, we demonstrate the successful implementation of reconfigurable field-programmable gate array technology into a pulse-resolved data acquisition system to achieve a femtosecond temporal resolution in ultrafast pump–probe experiments in real-time at large scale facilities. As proof of concept, electro-optic sampling of terahertz waveforms radiated by a superradiant emitter of a quasi-cw accelerator operating at a 50 kHz repetition rate and probed by an external laser system is performed. ...
Tópico(s): Photonic and Optical Devices
2024 - American Institute of Physics | Review of Scientific Instruments
Н. Г. Мокрышева, М. В. Шестакова, Ametov As, М. Б. Анциферов, И. Г. Бакулин, Т. В. Вавилова, G. R. Galstyan, T. Yu. Demidova, F. K. Dzgoeva, Т. Л. Каронова, Elena Lukina, А. M. Mkrtumyan, Н. А. Петунина, R. V. Ponomaryov, Н. А. Супонева, O. Y. Sukhareva, Минара Шамхаловна Шамхалова,
... V. Shestakova, Alexander S. Ametov, Mikhail B. Antsiferov, Igor G. Bakulin, Tatiana V. Vavilova, Gagik R. Galstyan, Tatiana Y. Demidova, Fatima K. Dzgoeva, Tatiana L. Karonova, Elena A. Lukina, Ashot M. Mkrtumyan, Rodion V. Ponomaryov, Natalia A. Suponeva, Olga Y. Sukhareva, Minara S. Shamkhalova (2024). Diabetes mellitus. 27(3). doi: 10.14341/DM13181 An error was made in the list of authors: Nina A. Petunina was not indicated as author of this article. The correct list of authors: Natalya G. Mokrysheva, Marina V. Shestakova, Alexander S. Ametov, Mikhail B. Antsiferov, Igor G. Bakulin, Tatiana V. Vavilova, Gagik R. Galstyan, ...
Tópico(s): Folate and B Vitamins Research
2024 - UP Print | Diabetes Mellitus
Igor A. Dain, Sergey A. Zolotov, Н. Б. Демина, Sergey A. Zolotov, Г. А. Бузанов, В. М. Ретивов, Yevgenii S. Ponomaryov,
Ibrutinib is an anticancer drug, a Bruton's tyrosine kinase inhibitor with poor solubility in aqueous media. This study reports on the study of the effectiveness of mesoporous carriers based on magnesium aluminometasilicate and poloxamers to improve the solubility and bioavailability of ibrutinib in the form of amorphous solid dispersions. The choice of the most effective composition was made on a parallel study of (a) a physical mixture of ibrutinib with a mesoporous carrier, (b) a solid dispersion ...
Tópico(s): Gastrointestinal Tumor Research and Treatment
2022 - Elsevier BV | OpenNano
Ruslan Salikhov, Igor Ilyakov, Anneke Reinold, Jan‐Christoph Deinert, Thales V. A. G. de Oliveira, Alexey Ponomaryov, Gulloo Lal Prajapati, Patrick Pilch, Ahmed Ghalgaoui, Max Koch, J. Faßbender, J. Lindner, Zhe Wang, Sergey Kovalev,
Tópico(s): Topological Materials and Phenomena
2025 - Nature Portfolio | Nature Communications
Sergey A. Zolotov, Н. Б. Демина, Igor A. Dain, Sergey A. Zolotov, Г. А. Бузанов, В. М. Ретивов, Yevgenii S. Ponomaryov,
Tópico(s): HIV/AIDS drug development and treatment
2022 - Springer Science+Business Media | Journal of Pharmaceutical Innovation