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Graphite on graphite
Письма в ЖЭТФ. 2016. Vol. 104. No. 12. P. 888-891.
Volovik G. E., Pudalov V. M.
In press
We propose potential geometry for fabrication of the graphite sheets with atomically smooth edges. For such sheets with Bernal stacking, the electron-electron interaction and topology should cause sufficiently high density of states resulting in the high temperature of either spin ordering or superconducting pairing.
Orekhov N. D., Stegailov V., Carbon (the Netherlands) 2015 Vol. 87 P. 358-364
The graphite melting temperature remains poorly determined despite the considerable effort accomplished since the work of Bundy (1963). The absence of a consensus on its melting temperature at normal conditions has been considered as a technical problem that motivated more and more sophisticated experiments. The experimental evidences of the maximum on the graphite melting curve ...
Added: March 15, 2017
O. O. Shvetsov, E. V. Deviatov, Physical Review B: Condensed Matter and Materials Physics 2020 Vol. 99 No. 12 P. 125305-1-125305-5
We experimentally investigate charge transport through a single planar junction between a Cd3As2 Dirac semimetal and a normal Au lead. For nonsuperconducting bulk Cd3As2 samples we observe non-Ohmic dV/dI(V ) curves, which strongly resemble standard Andreev reflection with a well-defined superconducting gap. Andreev-like behavior is demonstrated for Cd3As2 samples with different surface and contact preparation ...
Added: December 1, 2020
Пудалов В.М., Фролов А. В., Волков В. А. et al., Письма в Журнал экспериментальной и теоретической физики 2018 Т. 107 № 3 С. 193-197
The longitudinal magnetoresistance of the array of parallel-oriented bismuth nanowires each 100 nm in diameter grown by electrochemical deposition in nanopores of an Al2O3 membrane has been studied in magnetic fields up to 14 T and at temperatures down to 0.3 K. The resistance increases with the field and reaches a broad maximum in fields ...
Added: August 4, 2018
Orekhov N., Stegailov V., High Temperature 2014 Vol. 52 No. 2 P. 199-205
Questions on the behavior of the graphite melting curve have remained open during the last fifty years. The process of graphite melting in the pressure range of 2–14 GPa is investigated by the method of molecular dynamics using the model of reactive interatomic potential; the dynamics of meltingfront prop agation upon crystal superheating is considered, ...
Added: March 19, 2014
A. A. Melnikov, A. A. Sokolik, Frolov A. V. et al., Applied Physics Letters 2019 Vol. 114 P. 191107-1-191107-5
We have measured the ultrafast anisotropic optical response of highly doped graphene to an intense single cycle terahertz pulse. The time profile of the terahertz-induced anisotropy signal at 800 nm has minima and maxima repeating those of the pump terahertz electric field modulus. It grows with increasing carrier density and demonstrates a specific nonlinear dependence ...
Added: May 21, 2019
Yu. E. Lozovik, A. A. Sokolik, Zabolotskiy A. D., Physical Review B: Condensed Matter and Materials Physics 2015 Vol. 91 No. 075416 P. 1-8
Many-body effects on quantum capacitance, compressibility, renormalized Fermi velocity, kinetic and interaction energies of massless Dirac electrons in graphene, induced by the Coulomb interactions, are analyzed theoretically in the first-order, Hartree-Fock and random phase approximations. Recent experimental data on quantum capacitance and renormalized Fermi velocity are analyzed and compared with the theory. The bare Fermi ...
Added: December 24, 2014
Berman O., Kezerashvili R., Lozovik Y., Physical Review B: Condensed Matter and Materials Physics 2013 Vol. 88 No. 23 P. 235424
A novel type of spaser with the net amplification of surface plasmons (SPs) in a doped graphene nanoribbon is proposed. The plasmons in the THz region can be generated in a doped graphene nanoribbon due to nonradiative excitation by emitters like two level quantum dots located along a graphene nanoribbon. The minimal population inversion per ...
Added: January 13, 2014
Iakobson O. D., Gribkova O., Alexey R. Tameev et al., Journal of Industrial and Engineering Chemistry 2018 Vol. 65 P. 309-317
Composites based on graphene and water-dispersible polyaniline-poly(2-acrylamido-2-methyl-1-propanesulfonic acid) complex were shown as materials promising for the development of hole transporting layers (HTLs). By using multimodal atomic force microscopy, transmission electron microscopy, cyclic voltammetry and conductivity measurements, the relationship between the oxidation degree of graphene and the morphology, electrical conductivity and electron energy structure of HTLs was revealed. Utilizing the ...
Added: June 4, 2018
Rodionov Y. I., K.I. Kugel, Nori F., Physical Review B: Condensed Matter and Materials Physics 2016 Vol. 94 No. 19 P. 195108-1-195108-13
Using the Landau-Zener-Stuckelberg-Majorana-type (LZSM) semiclassical approach, we study both graphene and a thin film of aWeyl semimetal subjected to a strong ac electromagnetic field. The spectrum of quasienergies in the Weyl semimetal turns out to be similar to that of a graphene sheet. It has been predicted qualitatively that the transport properties of strongly irradiated ...
Added: February 19, 2017
Kagan M., Mitskan V. A., Korovushkiin M. M., Journal of Superconductivity and Novel Magnetism 2016 Vol. 29 No. 4 P. 1043-1048
We demonstrate the instability of the normal state of purely repulsive fermionic systems towards the transition to the Kohn-Luttinger superconducting state. We construct the superconducting phase diagrams of these systems in the framework of the Hubbard and Shubin-Vonsovsky models on the square and hexagonal lattices. We show that an account for the long-range Coulomb interactions, ...
Added: May 11, 2016
Kuntsevich A., Shupletsov A. V., Minkov G. M., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 97 P. 195431-1-195431-8
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 ...
Added: September 10, 2018
Morgun L., Pudalov V., Kugel K. et al., Physical Review B: Condensed Matter and Materials Physics 2019 Vol. 99 No. 9 P. 094512-1-094512-7
We report an experimental observation of superconductivity in Cd3As2 thin films without application of external pressure. The films under study were synthesized by magnetron sputtering. Surface studies suggest that the observed transport characteristics are related to the polycrystalline continuous part of the investigated films with a homogeneous distribution of elements and the Cd-to-As ratio close ...
Added: April 2, 2019
Миронов Б. Н., Асеев С. А., Sokolik A. A. et al., Журнал экспериментальной и теоретической физики 2018 Т. 154 № 3(9) С. 496-505
Исследована модификация графенового листа, полученного методом химического газофазного осаждения на медной мелкоячеистой сетке, под действием мощного фемтосекундного лазерного излучения. Установлено, что процесс длительного облучения образца в вакууме сопровождается 1) разрывом углеродных связей, о чем свидетельствует уменьшение яркости рефлексов, отвечающих дифракции электронного пучка на графене, и 2) образованием новых продуктов, о чем свидетельствуют появление новых дифракционных ...
Added: October 21, 2018
Yakov Matyushkin, Sergey D., Maxim M. et al., Nano Letters 2020 Vol. 20 No. 10 P. 7296-7303
Plasmonic interferometry is a rapidly growing area of research with a huge potential for applications in the terahertz frequency range. In this Letter, we explore a plasmonic interferometer based on graphene field effect transistor connected to specially designed antennas. As a key result, we observe helicity- and phase-sensitive conversion of circularly polarized radiation into dc ...
Added: March 2, 2021
Siahlo A. I., Poklonski N. A., Lebedev A. V. et al., PHYSICAL REVIEW MATERIALS 2018 Vol. 2 No. 03-6001 P. 1-9
Single-layer and bilayer carbon and hexagonal boron nitride nanoscrolls as well as nanoscrolls made of bilayer graphene/hexagonal boron nitride heterostructure are considered. Structures of stable states of the corresponding nanoscrolls prepared by rolling single-layer and bilayer rectangular nanoribbons are obtained based on the analytical model and numerical calculations. The lengths of nanoribbons for which stable ...
Added: October 22, 2018
Prudkoglyad V., Olshanetsky E. B., Kvon Z. D. et al., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 No. 15 P. 155437-1-155437-10
We report results of systematic measurements of charge transport properties of the 20.5-nm-wide HgTe-based quantum well in perpendicular magnetic field, performed under hydrostatic pressures up to 15.1 kbar. At ambient pressure, transport is well described by the two-band semiclassical model. In contrast, at elevated pressure, we observed nonmonotonic pressure dependence of resistivity at the “charge ...
Added: November 2, 2018
Kovaleva N. N., Chvostova D., Potůčhek Z. et al., 2D Materials 2019 Vol. 6 No. 4 P. 045021-1-045021-10
Plasma functionalization of graphene is one of the facile ways to tune its doping level without the
need for wet chemicals making graphene photoluminescent. Microscopic corrugations in the twodimensional
structure of bilayer CVD graphene having a quasi-free-suspended top layer, such as
graphene ripples, nanodomes, and bubbles, may significantly enhance local reactivity leading to
etching effects on exposure to plasma. ...
Added: October 21, 2019
Evlashin S., Fedorov F. S., Dyakonov P. V. et al., The Journal of Physical Chemistry Letters 2020 Vol. 11 No. 12 P. 4859-4865
Supercapacitors based on carbon nanomaterials are attracting much attention because of their high capacitance enabled by large specific surface area. The introduction of heteroatoms such as N or O enhances the specific capacitance of these materials. However, the mechanisms that lead to the increase in the specific capacitance are not yet well-studied. In this Letter, we ...
Added: June 4, 2020
Budkov Y., Kolesnikov A. L., Polymer Science - Series C 2018 Vol. 60 No. Supplement 1 P. 148-159
Theoretical models of the conformational behavior of flexible polymer chains in mixed solvents enunciated in the world literature during the last decade are critically reviewed. Models describing different mechanisms of coil-to-globule transitions in a good solvent induced by cosolvent addition are highlighted. Special attention is given to the analysis of theoretical approaches to describing the ...
Added: November 30, 2018
Казанцев Д. В., Казанцева Е. А., Кузнецов Е. В. et al., Известия РАН. Серия физическая 2017 Т. 81 № 12 С. 1709-1714
Описаны принципы работы безапертурного сканирующего микроскопа ближнего оптического поля (ASNOM). Зондом в приборе служит металлизированная игла атомно-силового микроскопа, и оптическое взаимодействие с объектами на поверхности локализовано вблизи ее острия размером в несколько нанометров. Тело иглы имеет длину в несколько микрон, и это обеспечивает высокую эффективность ее электромагнитного взаимодействия с падающими на нее извне и излучаемыми ...
Added: December 6, 2020
Antipov A., Seleznev V., Vakhtomin Y. et al., IOP Conference Series: Materials Science and Engineering (MSE) 2020 Vol. 781 No. 1 P. 012011-1-012011-5
Spectral characteristics of WSi and NbN superconducting single-photon detectors with different surface resistance and width of nanowire strips have been investigated in the wavelength range of 1.3-2.5 µm. WSi structures with narrower strips demonstrated better performance for detection of single photons in longer wavelength range. The difference in normalized photon count rate for such structures ...
Added: December 10, 2020
M. : Faculty of Physics, MSU, 2017
The Low Temperature Physics Conference is an international event held every three years, under the auspices of the IUPAP through its Commission C5 on Low Temperature Physics. The aim of these conferences is to exchange information and views among the members of the international scientific community in the general field of Low Temperature Physics. It ...
Added: October 1, 2017
Kuzmichev S. A., Kuzmicheva T. E., Tchesnokov S. N. et al., Journal of Superconductivity and Novel Magnetism 2016 Vol. 29 No. 4 P. 1111-1116
We present temperature dependences of the large and the small superconducting gaps measured directly by SnS-Andreev spectroscopy in various Fe-based superconductors and MgB2. The experimental L,S(T ) are wellfitted with a two-gap model based on Moskalenko and Suhl system of equations (supplemented with a BCS integral renormalization). From the fitting procedure, we estimate the key ...
Added: March 19, 2016
Mikheev A. V., Вестник Санкт-Петербургского университета. Серия 1. Математика. Механика. Астрономия 2007 № 2 С. 128-133
In this work we consider the task of stability of shallow orthotropic shell on elastic base. The dependence of critical load parameter on constants of shell’s elasticity and rigidity of base is considered. As example we analyse the case of spherical shell made of unidirectional glass-fiber material. ...
Added: January 31, 2013