101 citations · 504 across the 50 of their papers we have counts for
51 papers
Steady reservoir-mediated self-trapping of polariton condensates
Pavel N. Kozhevin, Oleg I. Utesov, Igor S. Aranson +2
Nonequilibrium bosonic condensates of exciton-polaritons generated by tightly focused incoherent optical beams are typically expected to form a stationary ballistically expanding s…
Subcritical bifurcation and on-off bistability in ballistic polariton condensates
Oleg I. Utesov, Soohong Choi, Pavel Kozhevin +11
Dynamics of exciton-polariton condensates under continuous-wave incoherent Gaussian optical pumping is considered. It is shown that the conventional supercritical Stuart-Landau pic…
Vector-field control and emergent basal-plane anisotropy of magnetic textures in noncentrosymmetric (FeNiPd)P
Victor Ukleev, Oleg I. Utesov, Lorenzo Ubilla +17
(FeNiPd)P is a room-temperature magnet with symmetry that hosts a rich variety of topological spin textures. Here, we report a combined resonant…
Frustration of harmonic and solitonic helimagnetism on the body-centered tetragonal lattice of GdAlSi
Ryota Nakano, Rinsuke Yamada, Oleg I. Utesov +9
The triangular lattice antiferromagnet (TLAF) with nearest-neighbor exchange interaction is a model platform in the field of frustrated magnetism. Here, anharmonic (`up-up-down') a…
Localization--non-ergodic transition in controllable-dimension fractal networks from diffusion-limited aggregation
Oleg I. Utesov, Alexei Andreanov, Tomasz Bednarek +2
Our study connects the physics of disordered integer-dimensional systems and regular self-similar objects by studying spectral properties of fractal agglomerates with tunable dimen…
Nematic Phase Transitions in 1D Flat Band Condensates
Yeongjun Kim, Oleg I. Utesov, Alexei Andreanov +2
We investigate the ground-state properties of one-dimensional Gross-Pitaevskii flat-band lattices which are parametrized through their compact localized state (CLS) amplitudes. We…
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-…
Thermodynamic theory of square skyrmion lattice in tetragonal frustrated antiferromagnets
Oleg I. Utesov, Danila P. Budylev
High-temperature part of the phase diagram of tetragonal frustrated antiferromagnets is discussed within the framework of the mean-field approach. Based on recent experimental find…
A Surface-confined Spiral State With the Double Period in the Cubic Chiral Helimagnet CuOSeO
Priya R. Baral, Oleg I. Utesov, Samuel H. Moody +10
The chiral magnetoelectric insulator CuOSeO hosts a rich and anisotropic magnetic phase diagram that includes helical, conical, field-polarised, tilted conical, and skyrmio…
Helical spin dynamics in CuOSeO as measured with small-angle neutron scattering
Victor Ukleev, Priya R. Baral, Robert Cubitt +3
The insulating chiral magnet CuOSeO exhibits a rich array of low-temperature magnetic phenomena, making it a prime candidate for the study of its spin dynamics. Using spin…
Mobility edges and fractal states in quasiperiodic Gross-Pitaevskii chains
Oleg I. Utesov, Yeongjun Kim, Sergej Flach
We explore properties of a Gross-Pitaevskii chain subject to an incommensurate periodic potential, i.e., a nonlinear Aubry-Andre model. We show that the condensate crucially impact…
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…
Observation of magnetic skyrmion lattice in CrMnGe by small-angle neutron scattering
Victor Ukleev, Tapas Samanta, Oleg I. Utesov +2
Incommensurate magnetic phases in chiral cubic crystals are an established source of topological spin textures such as skyrmion and hedgehog lattices, with potential applications i…
Competing anisotropies in the chiral cubic magnet CoZnMn unveiled by resonant x-ray magnetic scattering
Victor Ukleev, Oleg I. Utesov, Chen Luo +11
The cubic -Mn-type alloy CoZnMn is a chiral helimagnet that exhibits a peculiar temperature-dependent behavior in the spiral pitch, which decreases from 130 nm at ro…
Magnetoroton in a two-dimensional Bose-Bose mixture
O. I. Utesov, S. V. Andreev
We extend our theory of slow magnons in a two-component Bose-Einstein condensate to the case of two spatial dimensions (2D). We provide a detailed discussion of polaronic correctio…
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…
Ferromagnetic monolayer with interfacial Dzyaloshinskii-Moriya interaction: magnon spectrum and effect of quenched disorder
Oleg I. Utesov, Arseny V. Syromyatnikov
We discuss theoretically a ferromagnetic monolayer with an interfacial Dzyaloshinskii-Moriya interaction (iDMI) and a small axial anisotropy. It is shown that the system has a long…
Direct observation of the exchange anisotropy in the helimagnetic insulator CuOSeO
Priya R. Baral, Oleg I. Utesov, Chen Luo +4
The helical magnetic structures of cubic chiral systems are well-explained by the competition among Heisenberg exchange, Dzyaloshinskii-Moriya interaction, cubic anisotropy, and an…
Magnons in the fan phase of anisotropic frustrated antiferromagnets
Oleg I. Utesov
Elementary excitations spectrum of the fan phase of anisotropic frustrated antiferromagnets is discussed analytically. In the linear spin-wave approximation, the spectrum is determ…
Easy-plane antiferromagnet in tilted field: gap in magnon spectrum and susceptibility
Artemiy S. Sherbakov, Oleg I. Utesov
Motivated by recent experimental data on dichloro-tetrakis thiourea-nickel (DTN) [T.A. Soldatov , Phys. Rev. B , 104410 (2020)], a model of antiferromagn…
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…
Small-angle neutron scattering in fully polarized phase of non-collinear magnets with interfacial-like DMI
Oleg I. Utesov
Spin waves in non-collinear magnets with symmetry are discussed in the context of inelastic neutron scattering in small-angle scattering geometry. In the framework of a mi…
Spin wave stiffness and damping in a frustrated chiral helimagnet CoZnMn as measured by small-angle neutron scattering
V. Ukleev, K. A. Pschenichnyi, O. Utesov +7
Multiple intriguing low temperature phenomena have recently been discovered in the family of chiral cubic Co-Zn-Mn compounds with Mn-type structure. In particular, CoZn…