Quantum accurate SNAP carbon potential for MD shock simulations

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Quantum accurate SNAP carbon potential for MD shock simulations

AIP Conference Proceedings. 2020. Vol. 2272. No. 1. P. 070055-1–070055-5.

Belonoshko Anatoly B., Willman J., Williams A., Nguyen-Cong K., Thompson A., Wood M., Oleynik I.

We present a new quantum accurate Spectral Neighbor Analysis Potential (SNAP) machine-learning potential for simulating carbon under extreme conditions of dynamic compression (pressures up to 1 TPa and temperatures up to 10,000 K). The development of SNAP potential involves (1) the generation of the training database comprised of the consistent and meaningful set of first-principles DFT (Density Functional Theory) data for carbon materials at high pressure and temperature; (2) the robust and physically guided training of the SNAP parameters on first-principles data involving statistical data analysis; and (3) the validation of the SNAP potential in MD simulations of carbon at high PT conditions. The excellent performance of quadratic SNAP potential is demonstrated by simulating the radial distribution functions at high pressure-temperature conditions and melt curve of diamond, which were found in good …

Research target: Chemistry Physics

Priority areas: engineering science

Electrically driven Rabi dynamics of magnetic field induced corner states in a two-dimensional topological insulator

Lavrukhina E. A., Krasavin D. P., Krishtopenko S. S. et al., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 No. 22 Article 225414

We study coherent electric manipulation of magnetic field induced localized states at a double kink of a helical edge in a HgTe/CdHgTe quantum well. An in-plane magnetic field opens a gap in the one-dimensional (1D) edge spectrum, while changes in the edge orientation generate localized in-gap states at the kinks. We show that, for suitable ...

Added: October 19, 2026

Phase Transitions in the Ni2.14Mn0.81Fe0.05Ga Heusler Alloy under the Influence of a Magnetic Fild and Hydrostatic Pressure

Смерчанский П. С., Koledov V. V., Kamantsev A. P. et al., Physics of Metals and Metallography 2026 Vol. 127 No. 6-7 P. 689–693

Heusler alloys of the Ni2MnX family, where X = Ga, In, Sn, …, which have been shown to exhibit giant magnetocaloric effect (MCE) and magnetically controlled shape memory effect due to thermoelastic magnetostructural phase transition (MSPT), continue to attract attention. However, these functional properties are fully manifested in strong magnetic fields of at least several T. Currently, ...

Added: October 19, 2026

Structure and conformational dynamics of formamide molecule in the ground and lowest excited electronic states

Тукачев Н. В., Bataev V., Abramenkov A. et al., Computational and Theoretical Chemistry 2016 No. 1080 P. 23–32

Electronic state calculations, such as equilibrium geometry parameters, harmonic vibrational frequencies and potential barriers to conformational transitions (as well as conformer energy differences in excited states), using ab initio methods, such as MP2, CCSD(T), CASSCF, CASPT2 and MRCI, were carried out on the formamide molecule in the ground (S0) and the lowest excited singlet (S1) ...

Added: October 14, 2026

Conformational analysis of N-methylformamide in ground S0 and excited S1 and T1 electronic states

Тукачев Н. В., Bataev V. А., Godunov I. А., Journal of Quantitative Spectroscopy and Radiative Transfer 2016 Vol. 177 P. 291–300

For conformers of the N-methylformamide (HCONHCH3) molecule, calculations of equilibrium geometry parameters, harmonic vibration frequencies, energy differences and potential barriers to conformational transitions were performed in the ground (S0) and lowest excited singlet (S1) and triplet (T1) electronic states. In the S0 state, the molecule exists in trans and cis stable conformations (having Cs symmetry). ...

Added: October 14, 2026

Conformational analysis of acetamide in the ground and lowest excited electronic states

Тукачев Н. В., Bataev V. А., Godunov I. А., Journal of Quantitative Spectroscopy and Radiative Transfer 2017 Vol. 192 P. 30–41

For acetamide molecule (CH3CONH2) in the ground (S0) and lowest excited singlet (S1) and triplet (T1) electronic states calculations of equilibrium geometry parameters, harmonic vibrational frequencies and barriers to conformational transitions (also conformer energy differences in excited states) using following ab initio methods: MP2, CCSD(T), CASSCF, CASPT2 and MRCI were performed. One-, two- and three-dimensional ...

Added: October 14, 2026

Conformational analysis of N-methylacetamide molecule in the ground and excited electronic states

Тукачев Н. В., Bataev V. A., Godunov I. A., Computational and Theoretical Chemistry 2017 Vol. 1113 P. 82–93

Equilibrium geometry parameters, harmonic vibrational frequencies and barriers to conformational transitions and conformer energy differences for N-methylacetamide (CH3CONHCH3) molecule in S0, S1 and T1 electronic states were calculated in MP2 (S0) and CASPT2 (S1, T1) levels of theory. It is known that there are two planar (or effectively planar) conformers of N-methylacetamide in the ground ...

Added: October 14, 2026

Ground state geometry of PPV oligomers

Тукачев Н. В., Maslennikov D., Sosorev A. et al., The Journal of Physical Chemistry Letters 2019 Vol. 10 No. 12 P. 3232–3239

Conformational space of polyphenylenevinylene oligomers is systematically investigated computationally at energies relevant for room temperature dynamics in a solvent and in a solid state. Our calculations show that optimal oligomer structures are essentially planar. However, lack of a deep minimum at the planar geometry allows for large molecular deformations even at very low temperatures. At ...

Added: October 14, 2026

Effects of π-spacer and fluorine loading on the optoelectronic and photovoltaic properties of (X-DADAD)n benzodithiophene-based conjugated polymers

Тукачев Н. В., Akkuratov A., Kuznetsov I. et al., Synthetic Metals 2020 Vol. 259 Article 116231

Four new conjugated polymers based on benzodithiophene, thiophene and 2,1,3-benzothiadiazole or 5,6-difluoro-2,1,3-benzothiadiazole were synthesized and investigated as absorber materials for organic photovoltaics. The effect of (bi)thiophene π-spacers and fluorine substitution on the physicochemical and optoelectronic properties of the polymers was revealed and correlations were drawn with their electrical characteristics in organic solar cells. In particular, ...

Added: October 14, 2026

Toward probing of the local electron–phonon interaction in small-molecule organic semiconductors with Raman spectroscopy

Тукачев Н. В., Nuraliev M., Parashchuk O. et al., Journal of Chemical Physics 2020 Vol. 153 No. 17 Article 174303

Electron–phonon interaction strongly affects and often limits charge transport in organic semiconductors (OSs). However, approaches to its experimental probing are still in their infancy. In this study, we probe the local electron–phonon interaction (quantified by the charge-transfer reorganization energy) in small-molecule OSs by means of Raman spectroscopy. Applying density functional theory calculations to four series ...

Added: October 14, 2026

Design of Novel Thiazolothiazole-Containing Conjugated Polymers for Organic Solar Cells and Modules

Тукачев Н. В., Akkuratov A., Nikitenko S. et al., Solar Energy 2020 Vol. 198 P. 605–611

One of the major challenges in the field of organic photovoltaics is associated with high-throughput manufacturing of efficient and stable organic solar cells. Practical realization of technologies for production of large-area organic solar cells requires the development of novel materials with a defined combination of properties ensuring sufficient reliability and scalability of the process in ...

Added: October 14, 2026

Impact of the acceptor units on optoelectronic and photovoltaic properties of (XDADAD)n-type copolymers:computational and experimental study

Тукачев Н. В., Klimovich I., Prudnov F. et al., Dyes and Pigments 2021 Vol. 185 Article 108899

A series of ten conjugated polymers incorporating in their molecular frameworks extended DADAD building blocks with thiophene donor (D) and either benzotriazole, benzoxadiazole, benzothiadiazole, difluorobenzothiadiazole or quinoxaline acceptor (A) units were synthesized and characterized. The optoelectronic properties of new polymers were computed and experimentally investigated revealing a good relationship, which can guide further rational design ...

Added: October 14, 2026

Suppression of dynamic disorder by electrostatic interactions in structurally close organic semiconductors

Тукачев Н. В., Sosorev A., Parashchuk O. et al., Physical Chemistry Chemical Physics 2021 Vol. 23 No. 29 P. 15485–15491

Dynamic disorder manifested in fluctuations of charge transfer integrals considerably hinders charge transport in high-mobility organic semiconductors. Accordingly, strategies for suppression of the dynamic disorder are highly desirable. In this study, we suggest a novel promising strategy for suppression of dynamic disorder—tuning the molecular electrostatic potential. Specifically, we show that the intensities of the low-frequency ...

Added: October 14, 2026

Low-frequency vibrational modes in G-quadruplexes reveal the mechanical properties of nucleic acids

Тукачев Н. В., González-Jiménez M., Ramakrishnan G. et al., Physical Chemistry Chemical Physics 2021 Vol. 23 No. 23 P. 13250–13260

Low-frequency vibrations play an essential role in biomolecular processes involving DNA such as gene expression, charge transfer, drug intercalation, and DNA–protein recognition. However, understanding the vibrational basis of these mechanisms relies on theoretical models due to the lack of experimental evidence. Here we present the low-frequency vibrational spectra of G-quadruplexes (structures formed by four strands ...

Added: October 14, 2026

Effect of crack size and its position on cyclic deformation behavior of refractory highentropy alloy HfNbTiZr

Корзникова Е. А., Babicheva R. I., Davletbakov A. A. et al., JOURNAL OF MATERIALS SCIENCE: MATERIALS IN ENGINEERING 2026 Vol. 21 Article 84

The influence of crack position and its size on short-range ordering (SRO) and high-temperature cyclic deformation behavior of refractory high-entropy alloy (RHEA) HfNbTiZr using bicrystal models has been investigated by combined Monte-Carlo (MC) and molecular dynamics (MD) simulations. It was revealed that the SRO process is affected not only by the crack size, namely the ...

Added: September 24, 2026

Perovskite nanoparticles Cs4PbBr6 and CsPbBr3: synthesis, analysis and peculiar optical properties

Гущина В. А., / Series chemrxiv-2023-vpzhz-v2 "ChemRxiv". 2023.

All-inorganic perovskite CsPbBr3 and Cs4PbBr6 nanoparticles are being intensively studied due to their unique properties and wide range of applications; however, however, the nature of their optical properties is not yet fully understood due to the difficulty of synthesis of singlephase nanoparticles. In this article we describe the features of the synthesis of single-phase particles ...

Added: May 14, 2026

КВАНТОВО-ХИМИЧЕСКОЕ МОДЕЛИРОВАНИЕ МЕХАНИЗМА ЭКСТРАКЦИИ Fe(III) ИЗ СОЛЯНОКИСЛОГО ВОДНОГО РАСТВОРА ЭВТЕКТИЧЕСКИМИ РАСТВОРИТЕЛЯМИ НА ОСНОВЕ 1-ОКТАНОЛА

Мальцева В. Е., Милевская А. В., Милевский Н. А. et al., Теоретические основы химической технологии 2025 Т. 59 № 3 С. 13–22

Проведено квантово-химическое моделирование механизма экстракции Fe(III) из солянокислого раствора с использованием гидрофобных эвтектических растворителей на основе 1-октанола. Установлено, что путь реакции существенно различается в зависимости от того, является ли инертный компонент донором или акцептором водородной связи в димере с октанолом. На основе оценки прочности водородных связей показано, что более слабое взаимодействие между компонентами упрощает протекание ...

Added: May 13, 2026

Algorithmic overlaps as thermodynamic variables: from local to cluster Monte Carlo dynamics in critical phenomena

Pilé I., Deng Y., Shchur L., / Series arXiv "math". 2026. No. 2604.10254.

We investigate the spatial overlap of successive spin configurations in Markov chain Monte Carlo simulations using the local Metropolis algorithm and the Svendsen-Wang and Wolff cluster algorithms. We examine the dynamics of these algorithms for two models in different universality classes: the Ising model and the Potts model with three components. The overlap of two ...

Added: April 20, 2026

Multiphosphorylated molecules for buried interface regulation of inverted perovskite solar cells in a two-step process

Luo S., Bi Z., Xiong L. et al., Energy and Environmental Sciences 2026 Vol. 19 No. 6 P. 2069–2083

The insufficient coverage of self-assembled monolayer (SAM) and inadequate control of the buried interface of perovskite still limited the performance of perovskite solar cells (PSCs). Herein, we report a reinforcing SAM and managing perovskite buried interface strategy using ethylenediamine tetramethylenephosphonic acid (EAPA) to address these challenges. Firstly, the EAPA solution washes away the unbound or ...

Added: February 25, 2026

Thermal stability of monolayer fullerene networks: A molecular dynamics study with machine-learning potential

Alekseev D., Logunov M., Lazarev M. et al., Computational Materials Science 2025 Vol. 248 Article 113572

Two-dimensional C60 carbon allotropes have gained much attention since their first synthesis in 2022, but many of their thermophysical and mechanical properties remain unreported in the literature. In this article, we performed a high-temperature molecular dynamics study of quasi-hexagonal (qHP) and quasi-tetragonal (qTP) C60 phases using the modern machine-learning interatomic potential GAP-20. We show that, ...

Added: February 18, 2026

Compression-Induced Lattice Tilting Quenches Ion Migration at Metal Halide Perovskite Grain Boundaries: A Machine Learning Molecular Dynamics Study

Mikhail R. Samatov, Liu D., Emir S. Amirov et al., The Journal of Physical Chemistry Letters 2025 Vol. 16 No. 51 P. 13068–13074

Ion migration at grain boundaries (GBs) is a key issue leading to the performance degradation of metal halide perovskites (MHPs). Given the weak lattice interactions, the properties of MHPs are highly sensitive to external strain, which is inevitable in practical applications. Nevertheless, a fundamental understanding of the GB behavior under strain is still lacking. Using ...

Added: December 20, 2025

Assessing the Effects of Chemical Composition and Short-Range Ordering on the Tensile Deformation Behavior of Nanocrystalline High-Entropy Alloys Nb–Ta–Hf–Zr: A Combined Study on Molecular Dynamics and Monte Carlo Simulation

Babicheva R., Kumar A., Kiran R. et al., Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science 2025 Vol. 56 P. 5646–5663

In the work, simulations using Monte Carlo (MC) and molecular dynamics (MD) methods are carried out to investigate the Nb–Ta–Hf–Zr system refractory high-entropy alloys (HEAs). In particular, the effects of chemical composition and grain boundary (GB) network on short-range ordering (SRO) during combined MC/MD modeling of relaxation mimicking diffusion process are investigated on single-crystalline and ...

Added: November 27, 2025

A System Reanalysis of the Current Greenhouse Gases Budget of Terrestrial Ecosystems in Russia

Shvidenko A., Ciais P., Patra P. et al., Global Biogeochemical Cycles 2025 Vol. 39 No. 10 Article e2025GB008540

A system reanalysis of the current greenhouse gases budget of terrestrial ecosystems in russia / A. Shvidenko, P. Ciais, P. K. Patra et al. // Global Biogeochemical Cycles. — 2025. — Vol. 39, no. 10. — P. e2025GB008540. This study synthesizes the budgets of three greenhouse gases (GHG, namely CO2, CH4, N2O) forRussia over two decades (2000–2009 and 2010–2019) using bottom‐up and top‐down approaches, as part ...

Added: October 28, 2025

Immune Antibodies Recognizing the Stem Region of SARS-CoV-2 Spike Protein: Molecular Modelling and In Vitro Study of Synthetic Peptides Presentation to the Antibodies

Aliper E., Ryzhov I., Obukhova P. et al., Biochimica et Biophysica Acta - Biomembranes 2026 Vol. 1868 No. 1 Article 184472

Antibodies to peptide 1147 (amino acids 1147-61) of the SARS-CoV-2 protein S are highly diagnostic. Peptide 1147, although located in a region that is partly spatially hidden in the intact protein, is not subject to mutations, suggesting therapeutic potential. The aim of this study was to elucidate the architecture of this region and the way ...

Added: October 20, 2025

Diverse Interactions of Sterols with Amyloid Precursor Protein Transmembrane Domain Can Shift Distribution Between Alternative Amyloid-β Production Cascades in Manner Dependent on Local Lipid Environment

Volynsky P., Urban A., Pavlov K. et al., International Journal of Molecular Sciences 2025 Vol. 26 No. 2 Article 553

Alzheimer’s disease (AD) pathogenesis is correlated with the membrane content of various lipid species, including cholesterol, whose interactions with amyloid precursor protein (APP) have been extensively explored. Amyloid-β peptides triggering AD are products of APP cleavage by secretases, which differ depending on the APP and secretase location relative to ordered or disordered membrane microdomains. We used high-resolution NMR to probe ...

Added: October 12, 2025