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Hopping charge transport in amorphous organic and inorganic materials with spatially correlated random energy landscape
Russian Journal of Electrochemistry. 2017. Vol. 53. No. 3. P. 275–283.
The general properties of the hopping transport of charge carriers in amorphous organic and inorganic materials are discussed. The case where the random energy landscape in the material is strongly spatially correlated is considered. This situation is typical of organic materials with the Gaussian density of states (DOS) and may also be realized in some materials with the exponential DOS. It is demonstrated that the different DOS types can lead to very different functional forms of the mobility field dependence even for the identical correlation function of random energy. Important arguments are provided in favor of the significant contribution of the local orientational order to the total magnitude of energetic disorder in organic materials. A simple but promising model of charge transport in highly anisotropic composites materials is proposed.
Bogoslovskiy N. A., Петров П. В., Аверкиев Н. С., Physical Review B: Condensed Matter and Materials Physics 2024 No. 024436
We study the theoretical model of a ferromagnetic semiconductor as a system of randomly distributed
Ising spins with a long-range exchange interaction. Using the density-of-states approach, we
analytically obtain the magnetic susceptibility and heat capacity over a wide range of temperatures
and magnetic fields. It is shown that the finite system of spins in magnetic field less than ...
Added: July 9, 2025
S. V. Novikov, Russian Journal of Electrochemistry, Russia 2024 Vol. 60 No. 11 P. 904–912
Bimolecular recombination of charge carriers in amorphous organic semiconductors is discussed. A common feature of these materials is their spatial correlation of the random energy landscape in which hopping transport of charge carriers occurs. The recombination rate constant for such materials is calculated, including the case of locally ordered materials. It turns out that the ...
Added: December 13, 2024
Fadeeva Marina, Shchur L., / Series -- "Computers & Industrial Engineering". 2023. No. ssrn.4497091.
We apply a transition matrix in the energy spectrum to analyze the flatness criteria in each energy window of parallel implementation of the Wang-Landau algorithm. The tunneling time of a random walker in each window does depend on the position of the window in the energy spectrum and is much less than the tunneling time ...
Added: November 7, 2024
D.V. Seleznyov, V.O. Yagovtsev, N.G. Pugach et al., Journal of Magnetism and Magnetic Materials 2024 Vol. 595 Article 171645
A ferromagnetic insulator proximate with a superconductor induces some spin asymmetry in superconducting correlations. Density of states (DoS) changes as a result of the induction of magnetization in superconductor (S) under the influence of the inverse proximity effect with the ferromagnetic insulator (FI). The study solves the Usadel equations numerically and calculates characteristic features of ...
Added: March 14, 2024
Красавин А. В., Review of Scientific Instruments 2018 Vol. 89 Article 033907
A technique is presented of restoring the electronic density of states of the valence band from data of X-ray photoelectron spectroscopy (XPS). The originality of the technique consists in using a stochastic procedure to solve an integral equation relating the density of states and the experimental X-ray photoelectron spectra via the broadening function. To obtain ...
Added: July 18, 2023
Fuks A., Абросимова Г. Е., Аксенов О. И. et al., Физика твердого тела 2023 Т. 65 № 1 С. 35–38
Amorphous microwires of Fe73.8Si13B9.1Cu1Nb3.1 and Fe77.5Si13.5B9 composition fabricated by the Ulitovsky–
Taylor method were studied. The samples with the glass shell removed were heated at temperatures of 753 K
and 703 K for 20 min, afterwards, their structure was examined using X-ray diffraction. Subsequently, the
thermally treated samples were chemically etched and X-ray diffraction study of the structure ...
Added: May 23, 2023
Vitalii Yu. Kotov, Ivan S. Lunkov, Petr A. Buikin et al., New Journal of Chemistry 2023 Vol. 47 No. 5 P. 2666–2672
A series of hybrid halobismuthate solid solutions [4-Pi2C2]2[Bi2Br10-xIx] (4-PiC2 = 1,1′-(ethane-1,2-diyl)bis(4-methylpyridin-1-ium)) were obtained and structurally characterized. It was shown that upon Br/I substitution, the bromine atoms in the bridging positions of the anion were, first of all, replaced with iodine. In this case, significant and multidirectional deviation of the crystal lattice parameters of the solid solutions ...
Added: January 13, 2023
Mazanik A. A., Fominov Ya.V., Annals of Physics 2023 Vol. 449 Article 169199
We study the density of states (DoS) $\nu(E)$ in a normal-metallic (N) film contacted by a bulk superconductor (S). We assume that the system is diffusive and the SN interface is transparent. In the limit of thin N layer (compared to the coherence length), we analytically find three different types of the DoS peculiarity at ...
Added: December 27, 2022
Селезнёв Д. В., Yagovtsev V., Pugach N. et al., Физика металлов и металловедение 2023 Т. 124 № 2 С. 196–203
The magnetization induced in a superconductor due to the reverse proximity effect is studied in hybrid structures containing a superconductor and a ferromagnetic insulator. The study was carried out within the method of semiclassical Green’s functions, in which the Usadel equations are solved numerically with boundary conditions suitable for strongly spin-polarized ferromagnetic materials. The conversion ...
Added: November 17, 2022
Bosboom V., Van der Vegt J. J., Kupriyanov M. Y. et al., Superconductor Science and Technology 2022 Vol. 34 No. 11 Article 115022
We develop a quantitative model describing the distribution of the supercurrent density and
density of states in SN-N-NS type Josephson junctions in three dimensions (S is a
superconductor and N is a normal metal). The model is based on the self-consistent solution of
the quasiclassical Usadel equations using the finite element method. We investigate the
influence of the proximity ...
Added: October 31, 2022
Karabassov T., Valeriia D. Pashkovskaia, Nikita A. Parkhomenko et al., Beilstein Journal of Nanotechnology 2022 Vol. 13 P. 1418–1431
We present a quantitative study of the density of states (DOS) in SF bilayers (where S is a bulk superconductor and F is a ferromagnetic metal) in the diffusive limit. We solve the quasiclassical Usadel equations in the structure considering the presence of magnetic and spin–orbit scattering. For practical reasons, we propose the analytical solution ...
Added: October 14, 2022
Kuntsevich A., Миньков Г. М., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 No. 19
The phase of quantum magneto-oscillations is often associated with the Berry phase and is widely used to argue in favor of topological nontriviality of the system (Berry phase 2πn+π). Nevertheless, the experimentally determined value may deviate from 2πn+π arbitrarily, therefore more care should be made analyzing the phase of magneto-oscillations to distinguish trivial systems from nontrivial. In this ...
Added: June 17, 2022
Khoroshutin A. V., Lypenko D. A., Korlyukov A. et al., Synthetic Metals 2022 Vol. 287 Article 117094
A series of tricyclic naphthothiophenes – photocyclization products (8-methoxynaphtho[1,2-b]thiophene; 6,7-dimethoxynaphtho[1,2-b]thiophene; 8-methoxynaphtho[2,1-b]thiophene) have been studied. HOMO and LUMO levels, as well as a gap between them was accessed by cyclic voltammetry and optical spectroscopy. Double potential step chronoamperometry showed that the former naphthothiophene exhibits slower current decay than the other substances. Charge carrier mobility measured by the CELIV technique was ...
Added: June 7, 2022
Pikhteev Y., Корнейченко Е. Н., Новопашина А. Н., Известия Саратовского университета. Новая серия. Серия: Экономика. Управление. Право 2021 Т. 21 № 4 С. 398–404
Introduction. The article examines the spatial heterogeneity and factors of the exchange rate pass-through effect in consumer prices in Russian regions. Two hypotheses are tested. The first hypothesis is that there are differences in the magnitude of the pass-through between the Russian regions, the second is the significant influence of spatial relationships between regions on ...
Added: March 15, 2022
Aksenov O. I., Fuks A.A., Aronin A.S., Journal of Alloys and Compounds 2020 Vol. 836 P. 155472
The effect of tensile stresses on the magnetic properties of amorphous microwires with positive
magnetostriction has been studied. It has been determined that the experimental dependence of coercivity
on the tensile stresses is reversible and consists of linear and square root parts. The evolution of an
average stress level in the “core” and surface domain layer has been ...
Added: December 24, 2020
World Scientific, 2021.
This volume is dedicated to amorphous chalcogenides, namely, chalcogenide glasses and phase-change alloys. The observation by B T Kolomiets and N A Goryunova in the mid-1950s of semiconducting properties of chalcogenide glasses opened a new field in the physics of semiconductors: amorphous semiconductors. This discovery was highly unexpected since, until then, is was believed that ...
Added: November 11, 2020
Bobkova I.V., Bobkov A. M., JETP Letters 2019 Vol. 109 No. 1 P. 61–62
Influence of a nonmagnetic surface on the density of states in a spin-split superconductor, which is realized on the basis of a S/F bilayer, is investigated. It is demonstrated that if the ferromagnet magnetization has a defect in the form of a domain wall in the vicinity of the surface, the superconducting density of states ...
Added: November 19, 2019
Bobkova I.V., Bobkov A. M., Belzig W., New Journal of Physics 2019 Vol. 21 P. 043001
The existence of spin-triplet superconductivity in non-collinear magnetic heterostructures with superconductors is by now well established. This observation lays the foundation of superconducting spintronics with the aim to create a low-power consuming devices in order to replace the conventional electronics limited by heating. From a fundamental point of view the investigation of the structure and ...
Added: November 19, 2019
Norman G., Saitov I., Doklady Physics 2019 Vol. 64 No. 4 P. 145–149
—The structural transformation of solid hydrogen under compression along the isotherm of 100 K in
the region of transition into the conductive state was studied within the density functional theory. The pressure, the pair correlation function of protons, the density of electron states, and the electrical conductivity were calculated within a range of hydrogen densities from ...
Added: October 30, 2019
Shchur L., Journal of Physics: Conference Series 2019 Vol. 1252 P. 012010-1–012010-7
We review recent advances in the analysis of the Wang–Landau algorithm, which is designed for the direct Monte Carlo estimation of the density of states (DOS). In the case of a discrete energy spectrum, we present an approach based on introducing the transition matrix in the energy space (TMES). The TMES fully describes a random ...
Added: August 22, 2019