scholarly journals Electron-hole asymmetry in electron systems with orbital degeneracy and correlated hopping

2020 ◽  
Vol 23 (4) ◽  
pp. 43714
Author(s):  
Skorenkyy ◽  
Kramar ◽  
Dovhopyaty
Keyword(s):  
Electron Systems ◽  
Electron Hole ◽  
Orbital Degeneracy

scholarly journals CAUSALITY VERSUS WARD IDENTITY IN DISORDERED ELECTRON SYSTEMS

2004 ◽  
Vol 18 (19n20) ◽  
pp. 1051-1058 ◽  
Author(s):  
V. JANIŠ ◽  
J. KOLORENČ
Keyword(s):  
Ward Identity ◽  
The Self ◽  
Diffusive Transport ◽  
Electron Systems ◽  
Electron Hole ◽  
Consistency Conditions ◽  
Self Energy ◽  
Disordered Electron Systems ◽  
Symmetric Theory ◽  
Diffusion Pole

We address the problem of fulfilling consistency conditions in solutions for disordered noninteracting electrons. We prove that if we assume the existence of the diffusion pole in an electron–hole symmetric theory we cannot achieve a solution with a causal self-energy that would fully fit the Ward identity. Since the self-energy must be causal, we conclude that the Ward identity is partly violated in the diffusive transport regime of disordered electrons. We explain this violation in physical terms and discuss its consequences.

scholarly journals Фемтосекундное многофотонное возбуждение люминесценции примесных ионов в кристаллах

2019 ◽  
Vol 126 (3) ◽  
pp. 336
Author(s):  
В.И. Барышников ◽  
О.В. Горева ◽  
Ю.А. Григорьева ◽  
О.Л. Никонович
Keyword(s):  
Electron Beam Irradiation ◽  
Crystalline Material ◽  
Femtosecond Laser Irradiation ◽  
Electron Systems ◽  
Beam Irradiation ◽  
High Concentration ◽  
Electron Hole ◽  
Impurity Composition ◽  
Crystalline Materials ◽  
Photon Ionization

AbstractThe mechanism of excitation of the impurity luminescence in crystalline materials under intense femtosecond laser irradiation has been investigated. It is established that a high concentration of band electrons and holes, which are successively captured by impurity ions, is formed during the femtosecond three-photon ionization of the intrinsic crystalline material. The efficiency of electron–hole excitation of the impurity composition in crystals (as for the electron beam irradiation) is determined by the degree of difference between the electron systems of the s , p , and d subgroups of the outer shell of cations of the intrinsic material and activator.

scholarly journals Three-particle electron-hole complexes in two-dimensional electron systems

2018 ◽  
Vol 98 (20) ◽  
Author(s):  
V. A. Kuznetsov ◽  
L. V. Kulik ◽  
M. D. Velikanov ◽  
A. S. Zhuravlev ◽  
A. V. Gorbunov ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Electron Systems ◽  
Dimensional Electron ◽  
Electron Hole ◽  
Two Dimensional Electron Systems

Current Status of Solid-State X-Ray Systems

1985 ◽  
Vol 43 ◽  
pp. 158-161
Author(s):  
Martin Peckerar ◽  
Anastasios Tousimis
Keyword(s):  
Solid State ◽  
Electric Fields ◽  
Spectral Lines ◽  
Current Status ◽  
Mobile Charge ◽  
Electron Hole ◽  
X Ray ◽  
Sensing Systems ◽  
Transmission Electron ◽  
Electron Microscopes

Solid state x-ray sensing systems have been used for many years in conjunction with scanning and transmission electron microscopes. Such systems conveniently provide users with elemental area maps and quantitative chemical analyses of samples. Improvements on these tools are currently sought in the following areas: sensitivity at longer and shorter x-ray wavelengths and minimization of noise-broadening of spectral lines. In this paper, we review basic limitations and recent advances in each of these areas. Throughout the review, we emphasize the systems nature of the problem. That is. limitations exist not only in the sensor elements but also in the preamplifier/amplifier chain and in the interfaces between these components.Solid state x-ray sensors usually function by way of incident photons creating electron-hole pairs in semiconductor material. This radiation-produced mobile charge is swept into external circuitry by electric fields in the semiconductor bulk.

A correlation of CL emissions from Penrith sandstone with elemental distributions obtained by simultaneous SEM-CL and EDS analysis

1995 ◽  
Vol 53 ◽  
pp. 392-393
Author(s):  
Paul J. Wright
Keyword(s):  
Optical Microscope ◽  
Electron Gun ◽  
High Electron ◽  
Collection System ◽  
Electron Hole ◽  
Depositional Processes ◽  
Eds Analysis ◽  
Distribution Mapping ◽  
Backscattered Electron ◽  
Electron Imaging

Most industrial and academic geologists are familiar with the beautiful red and orange cathodoluminescence colours produced by carbonate minerals in an optical microscope with a cold cathode electron gun attached. The cement stratigraphies interpreted from colour photographs have been widely used to determine the post depositional processes which have modified sedimentary rock textures.However to study quartzose materials high electron densities and kV's are necessary to stimulate sufficient emission. A scanning electron microscope with an optical collection system and monochromator provides an adequate tool and gives the advantage of providing secondary and backscattered electron imaging as well as elemental analysis and distribution mapping via standard EDS/WDS facilities.It has been known that the incorporation of many elements modify the characteristics of the CL emissions from geological materials. They do this by taking up positions between the valence and conduction band thus providing sites to assist in the recombination of electron hole pairs.

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