Many-Body Theory for Time-Dependent Perturbations in Atomic Systems

1969 ◽  
Vol 22 (1) ◽  
pp. 8-12 ◽  
Author(s):  
N. C. Dutta ◽  
T. Ishihara ◽  
C. Matsubara ◽  
T. P. Das
Keyword(s):  
Time Dependent ◽  
Many Body ◽  
Atomic Systems ◽  
Many Body Theory ◽  
Body Theory

scholarly journals THEORY FOR SPIN–POLARIZED ELECTRON CAPTURE SPECTROSCOPY IN FERROMAGNETIC NICKEL

1993 ◽  
Vol 07 (01n03) ◽  
pp. 250-254
Author(s):  
W. HÜBNER ◽  
L. M. FALICOV
Keyword(s):  
Electron Capture ◽  
Time Scale ◽  
Nickel Atom ◽  
Time Dependent ◽  
Many Body ◽  
Many Body Theory ◽  
Interaction Terms ◽  
Quantum Numbers ◽  
Spin Polarized ◽  
Body Theory

A time-dependent many-body theory is developed for the study of spin-polarized electron capture spectroscopy. As a model system we choose the head-on collision of protons with a nickel atom. For the electronic part of the Hamiltonian we use the most general on-site interaction terms allowed by atomic symmetry. The total electronic many-body states are group-theoretically classified with respect to the conserved quantum numbers L, L z and S z. The time-dependent Schrödinger equation for this system is solved exactly. The zero-, one- and two- electron capture probabilities which are treated on the same footing are monitored along the trajectories of the scattering species on the femtosecond time scale. In good agreement with experiments on surfaces we find probabilities of 22% and 0.33% for one- and two-electron capture respectively and spin polarizations between -60% and -100%. The predominant capture of minority electrons is enhanced due to electronic correlations. This implies that the probing of magnetism occurs on a significantly longer time scale than the probing of single electron properties.

scholarly journals Dimension-dependent band alignment and excitonic effects in graphitic carbon nitride: a many-body perturbation and time-dependent density functional theory study

RSC Advances ◽  
2017 ◽  
Vol 7 (71) ◽  
pp. 44997-45002 ◽  
Author(s):  
W. F. Espinosa-García ◽  
J. M. Osorio-Guillén ◽  
C. Moyses Araujo
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Band Alignment ◽  
Time Dependent ◽  
Many Body ◽  
Functional Theory ◽  
Many Body Theory ◽  
Excitonic Effects ◽  
Body Theory ◽  
Dependent Density

First-principles many-body theory and time-dependent density functional theory were used to study the dimension effects on the band alignment and optical properties of s-triazine and graphitic C3N4.

scholarly journals Many-Body Theory of Atomic Systems Proceedings of the Nobel Symposium 46

1980 ◽  
Vol 21 (3-4) ◽  
pp. 227-227 ◽  
Author(s):  
Ingvar Lindgren ◽  
Stig Lundqvist
Keyword(s):  
Many Body ◽  
Atomic Systems ◽  
Many Body Theory ◽  
Body Theory

Many-Body Calculations of Dynamic Polarizability, Refractive Index and Verdet Coefficient

2006 ◽  
Vol 518 ◽  
pp. 331-336 ◽  
Author(s):  
A.R. Tančić ◽  
M. Davidović
Keyword(s):  
Refractive Index ◽  
Random Phase Approximation ◽  
Random Phase ◽  
Time Dependent ◽  
New Materials ◽  
Many Body ◽  
Dynamic Polarizability ◽  
Many Body Theory ◽  
The Many ◽  
Body Theory

Within the framework of the many-body theory by using the Random Phase Approximation with Exchange (RPAE) method we calculated the frequency dependent polarizability, refractive index, and Verdet coefficient of some atoms. Calculated time-dependent peculiarities of a set of atoms are very significant in the nano-region and might be important for designing new materials.

On the many-body theory of nuclear reactions

1968 ◽  
Vol 111 (1) ◽  
pp. 392-416 ◽  
Author(s):  
K DIETRICH ◽  
K HARA
Keyword(s):  
Nuclear Reactions ◽  
Many Body ◽  
Many Body Theory ◽  
The Many ◽  
Body Theory
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