The Determining Influence of the Perimeter of Graphene Islands on Phase Equilibria in Graphene–Metal System Containing Dissolved Carbon

Physics of the Solid State - It was found that an insignificant increase of the concentration of carbon atoms in the volume of metal (~2–3%) leads to a significant increase (by 3–4...     

Phonon Thermal Conductivity and Phase Equilibria of Fractal Bi–Sb Nanoparticles

Technical Physics - The thermal conductivity component associated with lattice vibrations is one of the quantities determining the thermoelectric activity of a material. We have simulated the...     

Geometric Phase in a Time-Dependent k-Boson and Fermi System

By using the Lewis–Riesenfeld invariant theory, the geometric phase in a time-dependent k-Boson and Fermi system has been studied. It is found that the geometric phase has nothing to do with the field frequency and the coupling coefficient between the Boson and Fermion.     

A Two-Parameter Model for the Metal–Semiconductor Phase Transition in a One-Dimensional Atomic System

A model is developed for a metal–semiconductor phase transition and a concurrent structural phase transformation in a one-dimensional system of atoms, each having one external electron. The interatomic interaction involves two components. One component is associated with atom shells, while another (of covalent nature) is due to overlap of the electron wave functions of neighboring atoms. It is found experimentally that the phase transition gives rise to the formation of a band gap in the electron spectrum and to the development of static phonon modes. These effects are accounted for by the numerical model under review. The results obtained are used to interpret the experimental data on the metal–semiconductor phase transition in VO₂.     

Nonlinear Dicke Quantum Phase Transition and Its Quantum Witness in a Cavity-Bose–Einstein-Condensate System

We investigate nonlinear Dicke quantum phase transition(QPT) induced by inter-atomic nonlinear interaction and its quantum witness in a cavity-Bose–Einstein-condensate(BEC) system. It is shown that inter-atomic nonlinear interaction in a cavity BEC system can induce first-order Dicke QPT. It is found that this nonlinear Dicke QPT can happen in an arbitrary coupling regime of the cavity and atoms. It is demonstrated that the quantum speed limit time can witness the Dicke QPT through its sudden change at the critical point of the QPT.     

Interactions in the Nitrobenzene–Molecular Sieves System

Implantation of nitrobenzene into the inner space of aluminosilicate mesoporous molecular sieves of the MSM–41 type was investigated. The interaction of nitrobenzene with the active centers of the inner surface of channels was studied by the method of IR spectroscopy. It was hypothesized that the possible mechanism of this interaction is the formation of hydrogen bonds of the –NO₂...HO–Al(Si) type.     

Spin-Exchange Collisions in the K–Li System

Optics and Spectroscopy - Spin-exchange cross sections and the magnetic-resonance frequency shift in collision of lithium and potassium atoms in the ground state have been calculated for the first...     

Structural Polarization in the Conductor–Insulator System

Technical Physics - The electrophysical properties of an insulator–conductor composite are studied. It is shown that the introduction of conductive phase in the insulator allows significant...     

Solid-Phase Interactions in the Bi–Au System

Physics of the Solid State - Contact solid-phase interactions under load in the Bi–Au binary system whose elements have significantly different rheological properties are studied. It was...     

Classical Electromagnetism and the Aharonov–Bohm Phase Shift

Although there is good experimental evidence for the Aharonov–Bohm phase shift occurring when a solenoid is placed between the beams forming a double-slit electron interference pattern, there has been very little analysis of the relevant classical electromagnetic forces. These forces between a point charge and a solenoid involve subtle relativistic effects of order v ² /c ² analogous to those discussed by Coleman and Van Vleck in their treatment of the Shockley–James paradox. In this article we show that a treatment exactly analogous to that given by Coleman and Van Vleck predicts classical electromagnetic forces which provide the basis for the Aharonov–Bohm phase shift. The magnetic force on the solenoid due to the passing charge leads to a displacement of the solenoid center of energy which must be balanced by the displacement of the passing charge. This classical displacement of the passing charge is exactly what is required to account for the Aharonov–Bohm phase shift. Also, we discuss a magnetic moment model which appears frequently in the literature and note that although the model provides conservation of linear momentum, it does not satisfy the general requirements for relativistic theories. We give an example suggesting that the new equation of motion for a magnetic moment proposed by Aharonov, Pearle, and Vaidman based upon the hidden momentum of the magnetic moment is completely inappropriate. Finally, we emphasize that the Aharonov–Casher phase shift is also explained by classical electromagnetic forces exactly parallel to those explaining the Aharonov–Bohm phase shift.     

Microstructure and Phase Composition of Rhenium and Ruthenium-Alloyed Ni–Al–Co System after Thermal Treatment

Russian Physics Journal - The paper presents the transmission electron microscopy investigations of the microstructure and phase composition of the nickel-based superalloy after high temperature...     

Phase Turbulence in the Complex Ginzburg-Landau Equation via Kuramoto–Sivashinsky Phase Dynamics

We study the Complex Ginzburg-Landau initial value problem for a complex field uC, with ,R. We consider the Benjamin–Feir linear instability region We show that for all and for all initial data u₀ sufficiently close to 1 (up to a global phase factor eⁱ₀,₀R) in the appropriate space, there exists a unique (spatially) periodic solution of space period L₀. These solutions are small even perturbations of the traveling wave solution, and s, have bounded norms in various L^p and Sobolev spaces. We prove that apart from corrections whenever the initial data satisfy this condition, and that in the linear instability range the dynamics is essentially determined by the motion of the phase alone, and so exhibits phase turbulence. Indeed, we prove that the phase satisfies the Kuramoto–Sivashinsky equation for times while the amplitude 1+² s is essentially constant.Supported in part by the Fonds National Suisse.     

Formation of the ω Phase in the Titanium—Iron System under Shear Deformation

JETP Letters - The effect of the phase composition on the α/β-Ti(Fe)→ω-Ti(Fe) transformation in the Ti-4 wt % Fe alloy under shear strain with high-pressure torsion (HPT) has...     

Phase Equilibrium and Critical Phenomena in the n-Pentan–Water and n-Hexane–Water Systems at High Temperatures and Pressures

Russian Physics Journal - PVTx-properties of the H2O – n-C5H12 and H2O – n-C6H14 mixtures are measured in the temperature range 303-680 K at pressures up to 60 MPa. The measurements...     

Thermal Conductivity and Thermoelectric Power of Compounds in the Cu–Ge–As–Se System

Technical Physics - The influence of temperature (in the interval of 300–400 K) and concentrations on the electrical conductivity, thermal conductivity, and thermoelectric power of copper...     

Non-Adiabatic Geometric Phase in a Dispersive Interaction System

We investigate the geometric phase and dynamic phase of a two-level fermionic system with dispersive interaction, driven by a quantized bosonic field which is simultaneously subjected to parametric amplification. It is found that the geometric phase is induced by a counterpart of the Stark shift. This effect is due to distinct shifts in the field frequency induced by interaction between different states （｜e〉 and ｜g〉 ） and cavity field, and a simple geometric interpretation of this phenomenon is given, which is helpful to understand the natural origin of the geometric phase.