Spin-Droplet State of an Interacting 2D Electron System
Physical Review Letters. 2012. Vol. 109. P. 226403.
We report thermodynamic magnetization measurements of two-dimensional electrons in several highmobility Si metal-oxide-semiconductor field-effect transistors. We provide evidence for an easily polarizable electron state in a wide density range from insulating to deep into the metallic phase. The temperature and magnetic field dependence of the magnetization is consistent with the formation of large-spin droplets in the insulating phase. These droplets melt in the metallic phase with increasing density and temperature, though they survive up to large densities.
Electron-electron interaction correction and magnetoresistance in tilted fields in Si-based two-dimensional systems
, , , Physical Review B: Condensed Matter and Materials Physics 2013 Vol. 87 P. 205406
We study the diffusive electron-electron interaction correction to conductivity by analyzing simultaneously ρxx and ρxy for disordered 2D electron systems in Si in a tilted magnetic field. Tilting the field is shown to be a straightforward tool to disentangle spin and orbital effects. In particular, by changing the tilt angle we prove experimentally that in ...
Added: October 15, 2016
, , , Physical Review B: Condensed Matter and Materials Physics 2016 Vol. 93 P. 205407
By measuring magnetoresistance and the Hall effect in a classically moderate perpendicular magnetic field in a Si-MOSFET-type macroscopic antidot array, we found a nonlinear with field, temperature- and density-dependent Hall resistivity. We argue that this nonlinearity originates from low mobility shells of the antidots with a strong temperature dependence of the resistivity and suggest a ...
Added: October 15, 2016
, , et al., Письма в Журнал экспериментальной и теоретической физики 2016 Т. 104 № 9 С. 651-657
В работе исследовалась магнетопроводимость тонких пленок Bi2Se3 с защитным слоем Se, выра щенных на подложках (111) BaF2. Наблюдаемая отрицательная магнетопроводимость в малых полях, обусловленная эффектом слабой антилокализации, так же как и осцилляции Шубникова–де Гааза в больших полях, определяется только перпендикулярной к плоскости пленки компонентой магнитного поля. Полученные экспериментальные результаты могут быть разумно объяснены в предположении на личия в исследуемых пленках ...
Added: December 6, 2016
Тезисы докладов 38 Совещания по физике низких температур (НТ-38) 17-22 сентября 2018 г., г. Москва - г. Ростов-на-Дону – пос. Шепси
Ростов н/Д: Издательство Фонд науки и образования, 2018
The collection presents abstracts included in the program "38 Meetings on low temperature physics". The sequence of abstracts corresponds to the sequence in which the reports are placed in the program of the Meeting. ...
Added: October 31, 2019
Temperature derivative of the chemical potential and its magnetooscillations in two-dimensional system
, , et al., JETP Letters 2015 Vol. 101 No. 2 P. 125-129
We report the first thermodynamic measurements of the temperature derivative of chemical potential (∂μ/∂T) in two-dimensional (2D) electron systems. In order to test the technique, we have chosen Schottky gated GaAs/AlGaAs heterojunctions and detected experimentally in this 2D system quantum magneto-oscillations of ∂μ/∂T. We also present a Lifshits-Kosevitch type theory for the ∂μ/∂T magneto-oscillations in ...
Added: October 15, 2016
, , , Journal of Chemical Physics 2011 Vol. 135 No. 14 P. 144901-1-144901-5
A Hamiltonian field theory of ferrohydrodynamics is derived, with dissipation included by use of a Rayleigh dissipation function. It is shown that kinematic assumptions on the behavior of magnetization under displacements of a volume element of fluid leave a certain freedom in the construction of dynamical equations describing the time-dependence of mass density, flow velocity, ...
Added: November 29, 2012
, , et al., Physical Review X 2018 Vol. 8 P. 031021-1-031021-8
Manifestations of quantum interference effects in macroscopic objects are rare. Weak localization is one of the few examples of such effects showing up in the electron transport through solid state. Here, we show that weak localization becomes prominent also in optical spectroscopy via detection of the electron spin dynamics. In particular, we find that weak localization controls the ...
Added: September 10, 2018
Probing Spontaneous Spin Magnetization and Two-Phase State in Two-Dimensional Correlated Electron System
, , , Journal of Superconductivity and Novel Magnetism 2017 Vol. 30 No. 3 P. 783-787
Strongly interacting two-dimensional (2D) carrier system has a tendency to spontaneous spin magnetization and mass divergence. Numerous experiments aimed to reveal these instabilities were not entirely convincing. In particular, spin susceptibility of itinerant electrons, determined from quantum oscillations, remains finite at the critical density of the 2D metal-insulator transition (MIT), n = n (c) . ...
Added: October 16, 2017
C2H2···CO complex and its radiation-induced transformations: a building block for cold synthetic astrochemistry
, , et al., Monthly Notices of the Royal Astronomical Society 2021 Vol. 506 No. 3 P. 3499-3510
In this work, we have examined the radiation-induced synthetic chemistry occurring in an astrochemically important C2H2–CO system at the molecular level using a matrix isolation approach. The 1:1 C2H2···CO intermolecular complex of linear structure was obtained in the solid low-temperature (5 K) noble gas matrices by deposition of the C2H2/CO/Ng (Ng = Ar, Kr, Xe) gaseous mixtures and ...
Added: November 16, 2021
Probing spin susceptibility of a correlated two-dimensional electron system by transport and magnetization measurements
, , et al., Physical Review B: Condensed Matter and Materials Physics 2018 Vol. 98 No. 155109 P. 1-15
We report temperature and density dependences of the spin susceptibility of strongly interacting electrons in Si inversion layers. We measured (i) the itinerant electron susceptibility χ∗ from the Shubnikov-de Haas oscillations in crossed magnetic fields and (ii) thermodynamic susceptibility χTsensitive to all the electrons in the layer. Both χ∗ and χT are strongly enhanced with lowering the electron density in the metallic ...
Added: October 26, 2018
, , et al., Journal of Physics: Conference Series 2018 Vol. 941 P. 1-4
We report preparation of nanoribbons (crossection ~ 250*25 nm2) by focused ion beam etching of single-crystalline Bi2Se3 and detailed measurements of their magnetoresistance at temperatures down to 4.2 K, magnetic field up to 9 T. In a magnetic field parallel to the axis of nanowire the magnetoresistance shows up oscillations. Surprisingly, the Fourier analysis shows ...
Added: February 25, 2018
Magnetization of the Mn1−xFexSi in high magnetic field up to 50 T: Possible evidence of a field-induced Griffiths phase
, , et al., JETP Letters 2016 Vol. 104 No. 2 P. 116-123
Magnetic properties of single crystals of Mn1−xFexSi solid solutions with x < 0.2 are investigated by pulsed field technique in magnetic fields up to 50 T. It is shown that magnetization of Mn1−xFexSi in the paramagnetic phase follows power law M(B) ~ Bα with the exponents α ∼ 0.33 − 0.5, which starts above characteristic fields Bc ∼ 1.5−7 T depending on the sample ...
Added: September 15, 2016
, , Nanopages 2013 No. 8 P. 1-7
A numerical study of the thermodynamic properties of a superconducting quantum cylinder in a longitudinal magnetic field is carried out. Closed-form expressions for the critical temperature, the free energy, the heat capacity jump, and the magnetization difference between the superconducting and normal phases as functions of the nanotube parameters are obtained in limit cases. ...
Added: September 11, 2013
, , , Известия высших учебных заведений. Физика 2010 Т. 53 № 7 С. 68-72
Выведены гамильтоновы уравнения движения непроводящей магнитной жидкости, в которой эволюция удельной намагниченности происходит согласно уравнению Ландау-Лифшица. Исследован спектр собственных мод системы. В аналитическом виде получены формулы описывающие эффект анизотропии скорости распространения звука и закон дисперсии спиновых волн в непроводящей магнитной жидкости. ...
Added: December 31, 2012
, , , Chemical Physics Letters 2020 Vol. 753 Article 137540
X-radiolysis of the noble-gas matrices containing both H2O and CO was investigated at 5 K using infrared spectroscopy. It was found that formic acid molecule (HCOOH) could be produced from the matrix-isolated H2O⋯CO complexes, either directly as a result of irradiation or upon the subsequent annealing activating the trans-HOCO + H reaction. The former way was ...
Added: February 10, 2021
, , QUANTUM SIZE EFFECT in BISMUTH NANOWIRES / Высшая школа экономики. 2016. No. хх.
Size-dependent quantization of the energy spectrum of conducting electrons in solids leads to oscillating dependence of electronic properties on corresponding dimension(s). In conventional metals with the high energy Fermi EF~1 eV and the charge carrier's effective masses m* of the order of the free electron mass m0, the quantum size phenomena provide noticeable impact only ...
Added: April 14, 2016
, , Письма в Журнал экспериментальной и теоретической физики 2020 Т. 111 № 1 С. 45-49
Представлены результаты изучения поперечного магнетосопротивления дираковского полуметалла InBi с узловой линией. Обнаружено, что магнетосопротивление не является квадратичным. В области малых магнитных полей B < 0.1 Тл оно характеризуется повышенной кривизной, в области средних описывается суммой линейного и квадратичного вкладов, а в области больших магнитных полей B > 1 Тл приближается к квадратичному закону с кривизной, в несколько раз меньшей кривизны вблизи нулевого ...
Added: October 28, 2021
Radiation-induced chemistry in the C2H2–H2O system at cryogenic temperatures: a matrix isolation study
, , et al., Monthly Notices of the Royal Astronomical Society 2020 Vol. 491 No. 4 P. 5140-5150
Investigations of the low-temperature radiation-induced transformations in the C2H2–H2O system are relevant to the chemistry occurring in interstellar and cometary ices. In this work, we applied a matrix isolation technique to study the radiation-driven evolution of this system at molecular level in order to get new mechanistic insight. The 1:1 C2H2⋅ ⋅ ⋅H2O complexes were prepared in ...
Added: January 21, 2021
Effect of inhomogeneous magnetization in optical second harmonic generation from layered nanostructures
, , et al., Optics Express 2021 Vol. 29 No. 2 P. 2106-2111
Magnetic nanostructures reveal unique interface induced properties that differ from those of bulk materials, thus magnetization distributions in interface regions are of high interest. Meanwhile, direct measurement of magnetization distribution in layered nanostructures is a complicated task. Here we study magnetic field induced effects in optical second harmonic generation (SHG) in three-layer ferromagnetic / heavy ...
Added: January 26, 2021
, Эпистемология и философия науки 2019 Т. 56 № 1 С. 169-184
The framework of simple opposition realism - anti-realism is not enough to analyze the views on the reality of unobservable objects of quantum theory. First, it is necessary to distinguish between realism in relation to the theory and realism in relation to the theory’s objects. Secondly, realism in relation to classical objects can be combined, ...
Added: February 12, 2020
Unconventional superconductivity in low density electron systems and conventional superconductivity in hydrogen metallic alloys
, JETP Letters 2016 Vol. 103 No. 11 P. 728-738
In this short review, we first discuss the results, which are mainly devoted to the generalizations of the famous Kohn–Luttinger mechanism of superconductivity in purely repulsive fermion systems at low electron densities. In the context of repulsive-U Hubbard model and Shubin–Vonsovsky model we consider briefly the superconducting phase diagrams and the symmetries of the order parameter ...
Added: November 18, 2016
, , et al., Journal of Lightwave Technology 2004 Vol. 22 No. 4 P. 1155-1168
This paper presents a method that allows evaluating the performance of an optical fiber system where bit errors result from a complex interplay of spontaneous noise generated in optical amplifiers and birefringent disorder of the transmission fiber. We demonstrate that in the presence of temporal fluctuations of birefringence characteristics, the bit-error rate (BER) itself is ...
Added: February 23, 2017
, , Journal of High Energy Physics 2022 No. 01 Article 43
We study regularization scheme dependence of beta-function for sigma models with two-dimensional target space. Working within four-loop approximation, we conjecture the scheme in which the beta-function retains only two tensor structures up to certain terms containing zeta_3. Using this scheme, we provide explicit solutions to RG flow equation corresponding to Yang-Baxter- and lambda-deformed SU(2)/U(1) sigma ...
Added: February 1, 2022
, , Scientific Reports 2018 Vol. 8 No. 1 P. 16915-1-16915-18
Sequential state discrimination is a strategy for quantum state discrimination of a sender’s quantum states when N receivers are separately located. In this report, we propose optical designs that can perform sequential state discrimination of two coherent states. For this purpose, we consider not only binary phase-shifting-key (BPSK) signals but also general coherent states, with arbitrary prior probabilities. Since ...
Added: November 16, 2020