Electron transport anomaly in a plasma in an intense radiation field

It is shown that in an intense radiation field the electron friction force resulting from electron-ion collisions becomes an electron accelerating force on account of absorption of radiation by electrons. It is pointed out that the thermal conductivity increases. Pis'ma Zh. éksp. Teor. Fiz. 64, No. 1, 19–22 (10 July 1996)     

Image charge approximations of reaction fields in solvents with arbitrary ionic strength

In this paper, we report a new development of image charge approximations of reaction fields for a charge inside a dielectric spherical cavity immersed in an ionic solvent with arbitrary ionic strength. This new development removes the requirement of low ionic strength of the solvent in a previous result [S. Deng, W. Cai, Extending the fast multipole method for charges inside a dielectric sphere in an ionic solvent: high-order image approximations for reaction fields, J. Comput. Phys. 227 (2007) 1246–1266], thus extending the applicability of the image charge approximations of reaction fields in the modeling of biomolecular solvation.     

Grating spacing dependence of nonvolatile holographic recording with arbitrary charge transport lengths

Grating spacing dependence of nonvolatile holographic recording in doubly doped lithium niobate crystals is theoretically investigated allowing arbitrary charge transport lengths. It is shown that the nonvolatile refractive index modulation initially increases with increasing grating spacing, then a saturation behavior arises because of the dominant bulk photovoltaic effect. Although different charge transport length results in different nonvolatile refractive index modulation, the grating spacing dependence of nonvolatile holographic recording obeys almost the same rules for arbitrary charge transport lengths. The experimental results obtained by recording nonvolatile holograms in LiNbO₃:Cu:Ce crystals with different grating spacing are consistent with the theoretical analyses.     

Modeling multibody effects in ionic solutions with a concentration dependent dielectric permittivity

We report a new strategy to parametrize effective ion-ion potentials for implicit solvent simulations of charged systems. The effective potential includes a pair term and a Coulomb term that by means of a concentration dependent dielectric permittivity takes into account multibody effects. We demonstrate that this approach allows us to accurately reproduce the solution osmotic properties and the ion coordination up to concentrations of 2.8 M aqueous NaCl.     

Quantum electrodynamics with arbitrary charge on a noncommutative space

Using the Seiberg-Witten map,we obtain a quantum electrodynamics on a noncommutative space,which has arbitrary charge and keep the gauge invariance to at the leading order in theta.The one-loop divergence and Compton scattering are reinvestigated.The uoncommutative effects are larger than those in ordinary noncommutative quantum electrodynamics.     

Quantum electrodynamics with arbitrary charge on a noncommutative space

Using the Seiberg-Witten map, we obtain a quantum electrodynamics on a noncommutative space, which has arbitrary charge and keep the gauge invariance to at the leading order in theta. The one-loop divergence and Compton scattering are reinvestigated. The noncommutative effects are larger than those in ordinary noncommutative quantum electrodynamics.     

Modeling of high permittivity insulator structure with interface charge by charge compensation

An analytical model of the power metal–oxide–semiconductor field-effect transistor(MOSFET)with high permittivity insulator structure(HKMOS)with interface charge is established based on superposition and developed for optimization by charge compensation.In light of charge compensation,the disturbance aroused by interface charge is efficiently compromised by introducing extra charge for maximizing breakdown voltage(BV)and minimizing specific ON-resistance(R_on,sp).From this optimization method,it is very efficient to obtain the design parameters to overcome the difficulty in implementing the R_on,sp–BV trade-off for quick design.The analytical results prove that in the HKMOS with positive or negative interface charge at a given length of drift region,the extraction of the parameters is qualitatively and quantitatively optimized for trading off BV and Ron,sp with JFET effect taken into account.     

Large-amplitude double layers in a dusty plasma with an arbitrary streaming ion beam

Formation of large-amplitude double layers in a dusty plasma whose constituents are electrons, ions, warm dust grains and positive ion beam are studied using Sagdeev’s pseudopotential technique. Existence of double layers is investigated. It is found that both the temperature of dust particles and ion beam temperature play significant roles in determining the region of the existence of double layers.     

Electron with arbitrary pseudo-spins in multilayer graphene

Using the low-energy effective Hamiltonian of the ABC-stacked multilayer graphene, the pseudo-spin coupling to real orbital angular momentum of electrons in multilayer graphene is investigated. We show that the electron wave function in N-layer graphene mimics the behavior of a particle with a spin of N ×( /2), where N = {1, 2, 3,...}. It is said that for N 1 the low-energy effective Hamiltonian for ABC-stacked graphene cannot be used to describe pseudo-spin-1/2particles. The wave function of electrons in multilayer graphene may behave like fermionic(or bosonic) particle for N being odd(or even). In this paper, we propose a theory of graphene serving as a host material of electrons with arbitrary pseudo-spins tunable by changing the number of graphene layers.     

A microinstability code for a uniform magnetized plasma with an arbitrary distribution function

We have developed a very general computer code for studying microinstabilities in a uniform magnetized plasma. Employing a new algorithm to perform two-dimensional numerical integrals in the conductivity tensor, the code can handle an arbitrary distribution function given by either an analytical function or numerical values on a momentum space grid and solve the full dispersion relation for an arbitrary propagation angle in either a non-relativistic or relativistic plasma except for a highly relativistic plasma (energy 1 MeV). The results for cyclotron-maser instability and whistler-wave instability are presented to illustrate the validity of the method.     

Screening of the dust-particle charge in a plasma with an external ionization source

An asymptotic theory of the screening of the dust-particle charge in a plasma with an external ionization source has been developed. It has been shown analytically that the screening of the charge of a dust particle adsorbing the charge of charged plasma particles that fall on it is not generally described by the Debye theory. The screening radius is determined by the relation between the coefficients β_ei and β_L = 4πek _i (k _i is the ion mobility) of the electron-ion and Langevin recombinations, respectively. When β_L ? β _ei , the screening radius is much larger than the electron Debye radius. It has been shown that the contribution of the ion component of an isothermal plasma to screening is equal to the electron contribution if the coefficient of the electron-ion recombination is twice or more larger than the Langevin coefficient of the ion recombination, β_ei ≥ 2β_L.     

On transient radiation of a charge in an inhomogeneous medium without limitations on permittivity variation and inhomogeneity scale

We consider the transient radiation of a charge passing through the boundary of two media with different permittivities without limitations on its variation and inhomogeneity scale. We propose a numerical method for solving the wave equation with the source in an inhomogeneous medium. The numerical data coincide perfectly with the analytical estimates in the field of their application.Research Institute of Physics, State University, Rostov-on-Don. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 38, No. 7, pp. 639–647, July, 1995.     

Consecutive reversible ionization-recombination reactions and ionic charge state distribution of Au plasma

The ionic charge state distribution is an important diagnostics parameter for laser in-ertia confinement fusion (LICF). It is usually obtained by solving Saha equation or using some other models, such as local thermodynamic equilibrium (LTE), corona equilibrium (CE), collision-radiation (CR) and average atom (AA); however, these methods are rather limited for high-Z element plasma. The theory of entropy fluctuation is also a pos-sible method[1]. Lawrence Livermore National Laboratory (…     

Vertical charge transport in a superlattice

It is demonstrated that the vertical charge transport in a superlattice is influenced uniquely by the difference in the effective mass of the electron between its adjacent layers. The mass difference produces a coupling between the parallel and vertical motions of the electron. As a consequence, the vertical velocity of an electron depends not only on its wavevector in the vertical direction but also on the wavevector in the direction parallel to the layers. As an illustration of the effect, a qualitative analysis is made to show that the vertical motion of the electron wavepacket can be altered by the application of a magnetic field whose direction is normal to the layers.     

Surface region of the space charge in a semiconductor with an arbitrary energy spectrum of the trapped states

The screening of the electric field in a semiconductor with an arbitrary energy spectrum of the trapped centers is discussed in this paper. Expressions which describe the voltage dependence of the capacitance are derived on the basis of the solution of Poisson's equation. An analysis is performed of the particular cases of a monoenergetic center and a quasicontinuous spectrum of charge localization centers with a constant and an exponential energy distribution density, and the possibility is noted of determining the parameters of this distribution by means of the processing of experimental results according to the formulas derived in this paper.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 54–58, November, 1979.     

Coupling of interface charge transfer to bulk transport properties of ionic crystals

The coupling of charge transport parameters in ionic crystals with parameters of charge transfer across the crystal-electrode interface, considered a source of vacancies, is discussed. It requires the annihilation of excess vacancy pairs at the interfaces. The steady state discharge parameters of oppositely charged carriers are mutually bound.     

The T-matrix for particle with arbitrary permittivity tensor and parallelization of the computational code

Using the T-matrix approach electromagnetic scattering by a non-axisymmetric particle with an arbitrary permittivity tensor is studied. The electromagnetic fields inside the scatterer are expressed by a system of quasi-spherical vector wave functions which are derived by the use of inverse Fourier transform. Using this expansion a solution of the light scattering problem in the framework of the null-field method is obtained. The implemented T-matrix program is parallelized using both OpenMP and MPI parallel paradigms. Numerical scattering results for anisotropic ellipsoids are presented.     

Width of quasi-energy levels of a one-electron ion with arbitrary nuclear charge

We consider a quasi-energy state of a single-electron multiply charged ion in a variable electric field which reduces to the Dirac state (21/20) in the absence of the field. We study the dependence of the radiative width of the quasilevel on the external field amplitude for different values of the frequency.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 96–100, September, 1983.We thank Prof. L. N. Labzovskii for useful discussions and comments.