Hadron polarization operator in superrenormalizable model

1979 ◽  
Vol 22 (11) ◽  
pp. 1165-1168
Author(s):  
S. A. Gadzhiev ◽  
A. I. Livashvili ◽  
V. A. Petrosyan
Keyword(s):  
Polarization Operator ◽  
Hadron Polarization

scholarly journals ELECTRON MASS OPERATOR IN A STRONG MAGNETIC FIELD

2002 ◽  
Vol 17 (04) ◽  
pp. 231-235 ◽  
Author(s):  
A. V. KUZNETSOV ◽  
N. V. MIKHEEV ◽  
M. V. OSIPOV
Keyword(s):  
Magnetic Field ◽  
Perturbation Theory ◽  
Strong Magnetic Field ◽  
Virtual Photon ◽  
Strong Field ◽  
Mass Operator ◽  
Polarization Operator ◽  
Landau Levels ◽  
Electron Mass ◽  
Photon Polarization

The electron mass operator in a strong magnetic field is calculated by summation of the leading log contributions in all orders of the perturbation theory. An influence of the strong field on the virtual photon polarization operator is taken into account. The contribution of higher Landau levels of virtual electrons, along with the ground Landau level, is shown to be essential in the leading log approximation.

Hadron Polarization in Strong Magnetic Field

2020 ◽  
Vol 17 (3) ◽  
pp. 289-295
Author(s):  
E. V. Luschevskaya ◽  
O. V. Teryaev ◽  
R. A. Ishkuvatov ◽  
O. E. Solovjeva
Keyword(s):  
Magnetic Field ◽  
Strong Magnetic Field ◽  
Hadron Polarization

A covariant polarization operator for s=1 particles

1964 ◽  
Vol 179 (2) ◽  
pp. 221-227
Author(s):  
H. H�gaasen
Keyword(s):  
Polarization Operator

FERMIONIC SUPERCONDUCTIVITY IN THE DENSE WEINBERG-SALAM MODEL

1990 ◽  
Vol 05 (17) ◽  
pp. 3417-3448 ◽  
Author(s):  
E.J. FERRER ◽  
V. DE LA INCERA ◽  
A.E. SHABAD
Keyword(s):  
Electromagnetic Field ◽  
Penetration Depth ◽  
Energy Gap ◽  
Polarization Operator ◽  
External Electromagnetic Field ◽  
Condensate Phase ◽  
Fermion Loop ◽  
Zero Momentum ◽  
The One

The superconducting behavior of the W-condensate phase of the Weinberg-Salam liquid is investigated. The removal of the W-orientation degeneracy by a small external electromagnetic field imposed on the W-condensate is found. Against the background of the condensed W-mesons the left-lepton spectrum undergoes a restructuring with the appearance of an energy gap between all the particle-antiparticle states, and the joining of particles and antiparticles in the new spectrum. Some of these peculiarities are indicated as a signal of the electrical superconductivity of such a medium. The definitive conclusions about the fermion superconductivity are achieved by studying the contribution to the London’s equation of the one-fermion loop polarization operator against the W-condensate background at zero momentum. The London’s penetration depth λ L is found in the limit of small W-condensate amplitude.

scholarly journals RPA APPROACH TO NON-LINEAR TRANSPORT IN QUANTUM DOTS

2009 ◽  
Vol 23 (20n21) ◽  
pp. 4414-4421
Author(s):  
B. TANATAR ◽  
V. MOLDOVEANU
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Random Phase ◽  
Tight Binding ◽  
Polarization Operator ◽  
Approximation Schemes ◽  
Theoretical Treatment ◽  
Gw Approximation ◽  
Linear Transport ◽  
Non Linear

An accurate theoretical treatment of electron-electron interactions in mesoscopic systems is available in very few cases and approximation schemes are developed in most of the applications, especially for many-level quantum dots. Here we present transport calculations within the random-phase approximation for the Coulomb interaction using the Keldysh Green's functions formalism. We describe the quantum dot systems by a tight-binding Hamiltonian. Our method is similar to the one used by Faleev and Stockman [Phys. Rev. B 66 085318 (2002)] in their study of the equilibrium properties of a homogeneous 2D electron gas. The important extension at the formal level is that we combine the RPA and the Keldysh formalism for studying non-linear transport properties of open quantum dots. Within the Keldysh formalism the polarization operator becomes a contour-ordered quantity that should be computed either from the non-interacting Green functions of the coupled quantum dot (the so-called G0W approximation) either self-consistently (GW approximation). We performed both non-selfconsistent and self-consistent calculations and compare the results. In particular we recover the Coulomb diamonds for interacting quantum dots and we discuss the charge sensing effects in parallel quantum dots.

scholarly journals QUANTUM FIELD THEORY IN GRAPHENE

2012 ◽  
Vol 27 (15) ◽  
pp. 1260007 ◽  
Author(s):  
I. V. FIALKOVSKY ◽  
D. V. VASSILEVICH
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Quantum Hall Effect ◽  
Faraday Effect ◽  
Quantum Hall ◽  
Tight Binding ◽  
Polarization Operator ◽  
Quantum Field ◽  
Tight Binding Model ◽  
Binding Model

This is a short nontechnical introduction to applications of the Quantum Field Theory methods to graphene. We derive the Dirac model from the tight binding model and describe calculations of the polarization operator (conductivity). Later on, we use this quantity to describe the Quantum Hall Effect, light absorption by graphene, the Faraday effect, and the Casimir interaction.

scholarly journals order of the polarization operator in Coulomb field at low energy

2009 ◽  
Vol 807 (1-2) ◽  
pp. 73-88 ◽  
Author(s):  
G.G. Kirilin ◽  
R.N. Lee
Keyword(s):  
Coulomb Field ◽  
Polarization Operator ◽  
Low Energy
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