101 citations · 115 across the 3 of their papers we have counts for
16 papers
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…
Thermodynamically stable skyrmion lattice in tetragonal frustrated antiferromagnet with dipolar interaction
Oleg I. Utesov
Motivated by recent experimental results on GdRuSi [Khanh, N.D., Nakajima, T., Yu, X. et al., \emph{Nat. Nanotechnol.} \textbf{15}, 444-449 (2020)], where nanometric square…
Phase competition in frustrated anisotropic antiferromagnet in strong magnetic field
O. I. Utesov, A. V. Syromyatnikov
We discuss theoretically a frustrated Heisenberg antiferromagnet in magnetic field close to the saturation one. It is demonstrated that a small biaxial anisotropy and/or the magnet…
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…
Self-consistent T-matrix approach to gap renormalization in quantum magnets with bond disorder
Oleg I. Utesov
Based on the self-consistent T-matrix approximation (SCTMA), analytical theory of density of states (DOS) in three-dimensional quantum magnets with the bond disorder is proposed. I…
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…