Anomalous Resistivity and the Electron–Polaron Effect in the Two-Band Hubbard Model with One Narrow Band
Abstract. We search for anomalous normal and superconductive behavior in the two-band Hubbard model with one narrow band. We analyze the influence of the electron– polaron effect and the Altshuler–Aronov effect on effective mass enhancement and scattering times of heavy and light components in the clean case. We find anomalous behavior of resistivity at high temperatures T >W∗h both in 3D and 2D situations. The SC instability in the model is governed by an enhanced Kohn–Luttinger effect for p-wave pairing of heavy electrons via polarization of light electrons.
The phenomenological analysis of the Homecomer and the The study of the Anabasis phenomenon via comparison of the theoretical prospectives from A. Schuetz (on Homecomer and Stranger) and conpemporary theories from the Sociology of Space, new mobilities and Marginality.
Presenting the findings of a major research project, this volume investigates the regional, ethnic and socio-cultural aspects of poverty and social exclusion in Russia in recent years. In-depth household interviews and survey data allowed teams from the UK, Denmark and Russia to compare different societies and communities in Russia across several different themes: the definition of poverty in different regional, ethnic and socio-cultural settings; the reproduction and formation of poverty subcultures in different societies and communities; the ethnic/national and political values of poor people; the readiness of poor people for social protest; and a comparison of Russia with other EU countries. Offering a wealth of original data collected following a period of rapid impoverishment of the Russian population, the study considers the challenge this presents to Western European models of poverty and social exclusion.
The collection of documents illustrates the life of the Soviet social underground and the state policy towards it during twenty post-War years. The first part of the book deals with distinct social groups, such as beggars, tramps, criminals etc. Such groups as disabled people and orphans are also described as risk groups. The second part of the book examines the legislation concerning social underground, the so called “struggle against social parasites”. The documents show the process of the formation of laws and their enforcement.
We study the thermodynamics of the three-dimensional Hubbard model at half filling on approach to the Néel transition by means of large-scale unbiased diagrammatic determinant Monte Carlo simulations. We obtain the transition temperature in the strongly correlated regime, as well as the temperature dependence of the energy, entropy, double occupancy, and nearest-neighbor spin correlation function. Our results improve the accuracy of previous unbiased studies and present accurate benchmarks in the ongoing effort to realize the antiferromagnetic state of matter with ultracold atoms in optical lattices.
The dynamics of a two-component Davydov-Scott (DS) soliton with a small mismatch of the initial location or velocity of the high-frequency (HF) component was investigated within the framework of the Zakharov-type system of two coupled equations for the HF and low-frequency (LF) fields. In this system, the HF field is described by the linear Schrödinger equation with the potential generated by the LF component varying in time and space. The LF component in this system is described by the Korteweg-de Vries equation with a term of quadratic influence of the HF field on the LF field. The frequency of the DS soliton`s component oscillation was found analytically using the balance equation. The perturbed DS soliton was shown to be stable. The analytical results were confirmed by numerical simulations.
Radiation conditions are described for various space regions, radiation-induced effects in spacecraft materials and equipment components are considered and information on theoretical, computational, and experimental methods for studying radiation effects are presented. The peculiarities of radiation effects on nanostructures and some problems related to modeling and radiation testing of such structures are considered.