scholarly journals Transient dynamics of a magnetic impurity coupled to superconducting electrodes: Exact numerics versus perturbation theory

2021 ◽  
Vol 104 (21) ◽  
Author(s):  
R. Seoane Souto ◽  
A. E. Feiguin ◽  
A. Martín-Rodero ◽  
A. Levy Yeyati
Keyword(s):  
Perturbation Theory ◽  
Magnetic Impurity ◽  
Transient Dynamics

scholarly journals Transient dynamics in interacting nanojunctions within self-consistent perturbation theory

2018 ◽  
Vol 20 (8) ◽  
pp. 083039 ◽  
Author(s):  
R Seoane Souto ◽  
R Avriller ◽  
A Levy Yeyati ◽  
A Martín-Rodero
Keyword(s):  
Perturbation Theory ◽  
Transient Dynamics ◽  
Self Consistent

scholarly journals RENORMALIZATION GROUP APPROACHES TO STRONGLY CORRELATED ELECTRON SYSTEMS

2001 ◽  
Vol 15 (19n20) ◽  
pp. 2549-2567 ◽  
Author(s):  
A. C. HEWSON ◽  
S. C. BRADLEY ◽  
R. BULLA ◽  
Y. ŌNO
Keyword(s):  
Perturbation Theory ◽  
Renormalization Group ◽  
Magnetic Impurity ◽  
Strongly Correlated Electron Systems ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron ◽  
Impurity Models

In recent years the numerical renormalization group (NRG) method has been extended to the calculation of dynamic response functions and transport properties of magnetic impurity models. The approach can now be applied more widely to lattice models of strongly correlated electron systems by the use of dynamical mean field theory (DMFT), in which the lattice problem is transformed into one for an effective impurity with an additional self-consistency constraint. We review these developments and assess the potential for further applications of this approach. We also discuss an alternative approach to renormalization, renormalized perturbation theory, in which the leading asymptotically exact results for the low temperature regime for a number of magnetic impurity models can be obtained within finite order perturbation theory.

scholarly journals Self-Consistent Perturbation Theory for Thermodynamics of Magnetic Impurity Systems

2006 ◽  
Vol 75 (Suppl) ◽  
pp. 256-258 ◽  
Author(s):  
Junya Otsuki ◽  
Hiroaki Kusunose ◽  
Yoshio Kuramoto
Keyword(s):  
Perturbation Theory ◽  
Magnetic Impurity ◽  
Self Consistent

A Perturbation Theory for the Population of Atomic Energy Levels in Non-Lte Plasmas

1988 ◽  
Vol 102 ◽  
pp. 343-347
Author(s):  
M. Klapisch
Keyword(s):  
Perturbation Theory ◽  
Small Parameter ◽  
Classification Scheme ◽  
Sum Rules ◽  
Energy Levels ◽  
Natural Classification ◽  
Quantum Numbers ◽  
Formal Expansion ◽  
Atomic Energy Levels ◽  
As Effects

AbstractA formal expansion of the CRM in powers of a small parameter is presented. The terms of the expansion are products of matrices. Inverses are interpreted as effects of cascades.It will be shown that this allows for the separation of the different contributions to the populations, thus providing a natural classification scheme for processes involving atoms in plasmas. Sum rules can be formulated, allowing the population of the levels, in some simple cases, to be related in a transparent way to the quantum numbers.

Energy, Information, and Superluminal Speed in Quantum Electrodynamics

2020 ◽  
pp. 27-33
Author(s):  
Boris A. Veklenko
Keyword(s):  
Electromagnetic Field ◽  
Perturbation Theory ◽  
Quantum Electrodynamics ◽  
Excited Atom ◽  
Standard Quantum ◽  
Energy Information

Without using the perturbation theory, the article demonstrates a possibility of superluminal information-carrying signals in standard quantum electrodynamics using the example of scattering of quantum electromagnetic field by an excited atom.

Adaptive Control of Transient Dynamics to Periodic Orbits

2014 ◽  
Vol 2 ◽  
pp. 82-85
Author(s):  
Hiroyasu Ando ◽  
Kazuyuki Aihara
Keyword(s):  
Adaptive Control ◽  
Periodic Orbits ◽  
Transient Dynamics
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