70 citations · 301 across the 20 of their papers we have counts for
20 papers
Rapid Determination of Nanodiamond Size Distribution and Impurity Concentration from Raman Spectra Using an Open Machine-Learning Toolbox
Sergei V. Koniakhin, Oleg I. Utesov, Vitaly I. Korepanov +1
Ready-to-use numerical toolbox for nanodiamond Raman spectra calculation and fit is presented. The developed theoretical approach allows accounting for arbitrary nanoparticle size-…
Phase locking of ring-shaped exciton-polariton condensates to coherent optical drive
A. N. Osipov, S. V. Koniakhin, O. I. Utesov +2
The effect of an additional quasi-resonant drive on the dynamics of the ring-shaped incoherently pumped polariton condensates carrying angular momentum (vorticity) is studied theor…
Raman peak shift and broadening in crystalline nanoparticles with lattice impurities
S. V. Koniakhin, O. I. Utesov, A. G. Yashenkin
The effect of point-like lattice impurities on nanoparticle Raman spectra (RS) is studied using both numerical and analytical methods. Particular cases of replacement atoms of vari…
Localized and extended collective optical phonon modes in regular and random arrays of contacting nanoparticles: escape from phonon confinement
S. V. Koniakhin, O. I. Utesov, A. G. Yashenkin
In the present paper, we utilize the coupled-oscillator model describing the hybridization of optical phonons in touching and/or overlapping particles in order to study the Raman s…
Coupled oscillators model for hybridized optical phonon modes in contacting nanosized particles and quantum dot molecules
S. V. Koniakhin, O. I. Utesov, A. G. Yashenkin
Modification of optical phonon spectra in contacting nanoparticles as compared to the single ones is studied. Optical phonons in dielectric and semiconducting particles obey the Eu…
Specific and non-specific effects of sodium and potassium ions on the interactions between model charged groups of proteins
Ivan N. Terterov, Sergei V. Koniakhin, Alexey A. Bogdanov
Potassium and sodium ions are crucial for many physiological processes in living systems and play different roles when interacting with proteins and enzymes. Intracellular concentr…
Effects of bond disorder and surface amorphization on optical phonon lifetimes and Raman peak shape in crystalline nanoparticles
Oleg I. Utesov, Sergei V. Koniakhin, Andrey G. Yashenkin
Optical phonons in nanoparticles with the randomness of interatomic bonds are considered both analytically and numerically. For weak dilute disorder two qualitatively different reg…
Lifetimes of Confined Optical Phonons and the Shape of a Raman Peak in Disordered Nanoparticles: II. Numerical Treatment
Sergei V. Koniakhin, Oleg I. Utesov, Andrey G. Yashenkin
Disorder-induced broadening of optical vibrational eigenmodes in nanoparticles of nonpolar crystals is studied numerically. The methods previously used to treat phonons in defectle…
Lifetimes of Confined Optical Phonons and the Shape of a Raman Peak in Disordered Nanoparticles: I. Analytical Treatment
Oleg I. Utesov, Andrey G. Yashenkin, Sergei V. Koniakhin
Microscopic description of Raman spectra in nanopowders of nonpolar crystals is accomplished by developing the theory of disorder-induced broadening of optical vibrational eigenmod…
Bench tests for microscopic theory of Raman scattering in powders of disordered nonpolar crystals: nanodiamonds and Si nanoparticles
Andrey G. Yashenkin, Oleg I. Utesov, Sergei V. Koniakhin
Recent Raman data on diamond and crystalline Si nanopowders are analyzed with the use of a microscopic theory of Raman scattering in ensembles of disordered nonpolar nanocrystals.…
Effects of resource competition on evolution and adaptive radiation
Sergei V. Koniakhin
The entanglement of population dynamics, evolution, and adaptive radiation for species competing for resources is studied. For resource harvesting, we modify the model used in Ref.…
Evidence of absorption dominating over scattering in light attenuation by nanodiamonds
S. V. Koniakhin, M. K. Rabchinskii, N. A. Besedina +3
We show an experimental evidence of the domination of absorption over scattering in absorbance spectra of detonation nanodiamonds. We perform the absorbance measurements on the UV-…
Raman spectra of nanoparticles: elasticity theory-like approach for optical phonons
O. I. Utesov, A. G. Yashenkin, S. V. Koniakhin
A simple way to investigate theoretically the Raman spectra (RS) of nonpolar nanoparticles is proposed. For this aim we substitute the original lattice optical phonon eigenproblem…
Novel approach to Raman spectra of nanoparticles
S. V. Koniakhin, O. I. Utesov, I. N. Terterov +3
In crystalline nanoparticles the Raman peak is downshifted with respect to the bulk material and has asymmetric broadening. These effects are straightly related to the finite size…
Ultracentrifugation for ultrafine nanodiamond fractionation
S. V. Koniakhin, N. A. Besedina, D. A. Kirilenko +2
In this paper we propose a method for ultrafine fractionation of nanodiamonds using the differential centrifugation in the fields up to 215000g. The developed protocols yield 4-6 n…
Molecular dynamics-based refinement of nanodiamond size measurements obtained with dynamic light scattering
S. V. Koniakhin, I. E. Eliseev, I. N. Terterov +3
The determination of particle size by dynamic light scattering uses the Stokes-Einstein relation, which can break down for nanoscale objects. Here we employ a molecular dynamics si…
Substrate-induced reduction of graphene thermal conductivity
Sergei Koniakhin, Oleg Utesov, Ivan Terterov +1
We develop the theory of heat conductivity in supported graphene, accounting for coherent phonon scattering on disorder induced by an amorphous substrate. We derive spectra for in-…
Drag of electrons in graphene by substrate surface polar phonons
S. V. Koniakhin, A. V. Nalitov
It is known that electron scattering by surface polar phonons (SPPs) of the substrate reduces their mobility in supported graphene. However, there is no experimental evidence for c…
New explanation of Raman peak redshift in nanoparticles
A. P. Meilakhs, S. V. Koniakhin
In this letter, we propose a new model that explains the Raman peak downshift observed in nanoparticles with respect to bulk materials. The proposed model takes into account discre…
Phonon drag thermopower in graphene in equipartition regime
S. V. Koniakhin, E. D. Eidelman
This letter calculates the contribution of electron-phonon interaction to thermoelectric effects in graphene. One considers the case of free standing graphene taking into account i…