Determination of the spin-polarized surface density of states in strongly correlated metals by field emission: Theory

1975 ◽  
Vol 11 (8) ◽  
pp. 3208-3209 ◽  
Author(s):  
David R. Penn
Keyword(s):  
Field Emission ◽  
Density Of States ◽  
Surface Density ◽  
Strongly Correlated ◽  
Spin Polarized ◽  
Polarized Surface

Field emission as a probe of the surface density of states

1974 ◽  
Vol 9 (4) ◽  
pp. 1216-1222 ◽  
Author(s):  
David R. Penn ◽  
E. W. Plummer
Keyword(s):  
Field Emission ◽  
Density Of States ◽  
Surface Density

Surface density of states and field emission

1976 ◽  
Vol 13 (4) ◽  
pp. 1536-1547 ◽  
Author(s):  
A. Modinos ◽  
N. Nicolaou
Keyword(s):  
Field Emission ◽  
Density Of States ◽  
Surface Density

SELF-ENERGIES, RENORMALIZATION FACTOR, LUTTINGER SUM RULE AND QUASIPARTICLE STRUCTURE OF THE HUBBARD SYSTEMS

1992 ◽  
Vol 06 (13) ◽  
pp. 2375-2392 ◽  
Author(s):  
F. LÓPEZ-AGUILAR ◽  
J. COSTA-QUINTANA
Keyword(s):  
Density Of States ◽  
Theoretical Method ◽  
Band Structure Calculation ◽  
Strongly Correlated ◽  
Spectral Functions ◽  
Augmented Plane Wave ◽  
Plane Wave Method ◽  
Hartree Fock ◽  
Self Energy

In this paper, we give a method for obtaining the renormalized electronic structure of the Hubbard systems. The first step is the determination of the self-energy beyond the Hartree-Fock approximation. This self-energy is constructed from several dielectric response functions. The second step is the determination of the quasiparticle band structure calculation which is performed from an appropriate modification of the augmented plane wave method. The third step consists in the determination of the renormalized density of states deduced from the spectral functions. The analysis of the renormalized density of states of the strongly correlated systems leads to the conclusion that there exist three types of resonances in their electronic structures, the lower energy resonances (LER), the middle energy resonances (MER) and the upper energy resonances (UER). In addition, we analyze the conditions for which the Luttinger theorem is satisfied. All of these questions are determined in a characteristic example which allows to test the theoretical method.

A Comparative Analysis of the Power of Selected European Countries. The Economic Determinants

2021 ◽  
Vol 37 (37) ◽  
pp. 22-42
Author(s):  
Alicja Paluch ◽  
Henryk Spustek
Keyword(s):  
Czech Republic ◽  
Comparative Analysis ◽  
European Countries ◽  
Economic Power ◽  
Strongly Correlated ◽  
The Czech Republic ◽  
Independent Variables ◽  
Economic Sphere ◽  
National Power

The ever-increasing need for in-depth analysis and quantification of the national power, in particular ‘hard’ and ‘soft’ power-generating factors as well as difficulties in identifying a comprehensive and effective method for scientific determination of the national power, have given rise to research in the indicated scientific issues within this article. The presented considerations aim to define the assumptions for a descriptive sub-model that would enable a comparison of Poland’s power in the economic sphere (which is a component of the non-military sphere) with the power of selected European countries. The research hypothesis is that, among the variety of descriptive variables in the economic sphere of the national power, there is a subset of mutually independent variables, at the same time strongly correlated with the national power, which make it possible to define assumptions for the sub-model of the national power. The steps of the research procedure were carried out using the method of system analysis (multi-criteria comparative analysis) and statistical analysis. The research activities undertaken have shown that the factors that are strongly correlated with the national power in the economic area of the European countries adopted for the analysis are: dynamics of industrial production, private sector credit flows and economic freedom index. The comparative analysis carried out demonstrates that the greatest increase in the economic power in the analysed period took place in Germany (0.68). Slightly smaller growth was recorded in the Czech Republic (0.62) and Poland (0.60), while the lowest value of increase was in Romania (0.23). The conducted qualitative comparative analysis of the economic power of selected European countries allowed to conclude that the independent variables identified are crucial for the formation of the economic power of the analysed countries. At the same time, a fairly strong position of the Czech Republic and Poland in relation to the economic power of Germany was found. The performed quantification of the economic power of the European countries provides a basis for the correct determination of changes in the power distribution of political units, assessment of the power and resources held by the state.

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