scholarly journals Magnetic fluctuations and self-energy effects in two-dimensional itinerant systems with a van Hove singularity in the electronic spectrum

2011 ◽  
Vol 83 (24) ◽  
Author(s):  
P. A. Igoshev ◽  
V. Yu. Irkhin ◽  
A. A. Katanin
Keyword(s):  
Electronic Spectrum ◽  
Two Dimensional ◽  
Magnetic Fluctuations ◽  
Van Hove Singularity ◽  
Self Energy

scholarly journals Vertex Corrections in Gauge Theories for Two-dimensional Condensed Matter Systems

1998 ◽  
Vol 12 (16n17) ◽  
pp. 1673-1692 ◽  
Author(s):  
Peter Kopietz
Keyword(s):  
Gauge Field ◽  
Condensed Matter ◽  
Finite Energy ◽  
Energy Scale ◽  
Gauge Fields ◽  
Logarithmic Correction ◽  
Two Dimensional ◽  
Numerical Constant ◽  
Self Energy ◽  
Vertex Corrections

We calculate the self-energy of two-dimensional fermions that are coupled to transverse gauge fields, taking two-loop corrections into account. Given a bare gauge field propagator that diverges for small momentum transfers q as 1/qη, 1<η≤ 2, the fermionic self-energy without vertex corrections vanishes for small frequencies ω as Σ(ω)∝ ωγ with γ=2/(1+η)<1. We show that inclusion of the leading radiative correction to the fermion-gauge field vertex leads to Σ(ω)∝ωγ [1-aη ln (ω0/ω)], where aη is a positive numerical constant and ω0 is some finite energy scale. The negative logarithmic correction is consistent with the scenario that higher order vertex corrections push the exponent γ to larger values.

scholarly journals Magnetic fluctuations in two-dimensional metals close to the Stoner instability

2000 ◽  
Vol 62 (22) ◽  
pp. 14898-14911 ◽  
Author(s):  
B. N. Narozhny ◽  
I. L. Aleiner ◽  
A. I. Larkin
Keyword(s):  
Two Dimensional ◽  
Magnetic Fluctuations

Electronic spectrum of a two-dimensional Fibonacci lattice

1999 ◽  
Vol 89 (5) ◽  
pp. 995-999 ◽  
Author(s):  
Yu. Kh. Vekilov ◽  
I. A. Gordeev ◽  
É. I. Isaev
Keyword(s):  
Electronic Spectrum ◽  
Two Dimensional ◽  
Fibonacci Lattice

Self-energy corrections to the electronic spectrum of the Hubbard model

2004 ◽  
Vol 272-276 ◽  
pp. 456-457 ◽  
Author(s):  
A Avella ◽  
S Krivenko ◽  
F Mancini ◽  
N.M Plakida
Keyword(s):  
Hubbard Model ◽  
Electronic Spectrum ◽  
Self Energy

scholarly journals Modeling of Two-Dimensional Light Bullets Propagation in an Array of Carbon Nanotubes Taking into Account the Mechanical Tension and Magnetic Field

2020 ◽  
pp. 36-44
Author(s):  
Natalia Konobeeva ◽  
Dmitry Skvortsov
Keyword(s):  
Magnetic Field ◽  
Carbon Nanotubes ◽  
Gauge Theory ◽  
Magnetic Fields ◽  
Electronic Spectrum ◽  
Acoustic Field ◽  
Two Dimensional ◽  
Mechanical Tension ◽  
Light Bullet ◽  
The Magnetic Field

In this paper, we study the influence of acoustic and magnetic fields on the propagation of twodimensional light bullet in an array of carbon nanotubes. The acoustic field is taken into account in the framework of the gauge theory. A magnetic field is applied along the nanotube axis and leads to a change in the electronic spectrum of ?electrons. It is shown, that the pulse stably propagates in the medium, taking into account both of these factors. In this case, the magnetic field and tension slows down the pulse, as well as changes its amplitude.

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