Zobrazeno 1 - 10
of 204
pro vyhledávání: '"Fil, D."'
Autor:
Kravchenko, L. Yu., Fil, D. V.
An influence of Mg and Si dopants on the formation energies and the concentration of point defects in yttrium aluminum garnet (YAG) is studied using the density functional approach. The formation energies of Mg and Si substitutional and interstitial
Externí odkaz:
http://arxiv.org/abs/2301.05170
Publikováno v:
Low Temp. Phys. 48, 537 (2022)
The mechanisms of magnetoelastic interaction in MnF$_2$ are studied using the method of acoustoelectric transformation. The temperature dependence of the piezomagnetic coupling coefficient and its anisotropy are determined in the antiferromagnetic ph
Externí odkaz:
http://arxiv.org/abs/2203.10805
Autor:
Fil, D. V., Shevchenko, S. I.
Publikováno v:
Low Temp. Phys. 48, 429 (2022)
Dislocation model of the supersolid state of $^4$He was proposed in 1987 by one of the authors of the review. The model obtained strong support by numerous experimental and theoretical investigations from 2007 to date. In these investigations the val
Externí odkaz:
http://arxiv.org/abs/2203.09189
Autor:
Fil, D. V., Shevchenko, S. I.
Publikováno v:
Phys. Rev. B 103, 205419 (2021)
Stationary waves in the condensate of electron-hole pairs in the $n-p$ bilayer system are studied. The system demonstrates the transition from a uniform (superfluid) to a nonuniform (supersolid) state. The precursor of this transition is the appearan
Externí odkaz:
http://arxiv.org/abs/2105.09131
Autor:
Kravchenko, L. Yu., Fil, D. V.
Publikováno v:
Physical Review Research 2, 023135 (2020)
We study mechanisms of control of charge state and concentration of different point defects in doped insulating crystals. The approach is based on the density functional theory calculations. We apply it to the problem of obtaining of Ti-doped sapphir
Externí odkaz:
http://arxiv.org/abs/2011.10419
Autor:
Fil, D. V., Shevchenko, S. I.
Using coherent-state formalism (the Keldysh formalism), the article describes a transition from a homogeneous superfluid state to a supersolid state in a two-dimensional dilute gas of electron-hole pairs with spatially separated components. Such a tr
Externí odkaz:
http://arxiv.org/abs/2004.12930
Autor:
Fil, D. V.
Publikováno v:
Journal of V.N. Karazin Kharkiv National University, series "Physics", No 30 (2019), p 69-76
Nonperturbative approach based on exact solution of Boltzmann kinetic equation in the relaxation time approximation is developed for the study of nonlinear response of electron-doped few-layer graphene to a high-frequency electromagnetic field. It is
Externí odkaz:
http://arxiv.org/abs/2001.08591
Autor:
Germash, K. V., Fil, D. V.
Publikováno v:
Phys. Rev. B 99, 125412 (2019)
The impact of electron-hole pairing on the spectrum of plasma excitations in double layer systems is investigated. The theory is developed with reference to a double monolayer graphene. Taking into account the coupling of scalar potential oscillation
Externí odkaz:
http://arxiv.org/abs/1811.05899
Autor:
Kravchenko, L. Yu., Fil, D. V.
Publikováno v:
Journal of Applied Physics 123, 023104 (2018)
First-principles calculations have been performed to study the formation of defect complexes in Ti doped alpha-Al2O3 crystals. The formation energies of isolated Ti3+ and Ti4+ defects, pairs, triples and quadruples of Ti ions and Al vacancies are com
Externí odkaz:
http://arxiv.org/abs/1708.08850
Autor:
Germash, K. V., Fil, D. V.
Publikováno v:
EPL, 118 (2017) 67008
A manifestation of electron-hole pairing in nonlinear electromagnetic response of a double layer graphene system is studied. It is shown that the pairing causes the appearance of a number of peaks in the frequency dependence of the intensity of the t
Externí odkaz:
http://arxiv.org/abs/1708.04083