A theoretical approach to strong-coupling superconductivity in ultra-high fields in consideration of vertex corrections to Eliashberg—Migdal equations

1996 ◽  
Vol 216 (3-4) ◽  
pp. 281-284 ◽  
Author(s):  
Hiroki Goto ◽  
Yuhei Natsume
Keyword(s):  
Strong Coupling ◽  
Theoretical Approach ◽  
Vertex Corrections ◽  
High Fields

Cooper Instability for a Given Field in a Quiescent Fermi Gas

1998 ◽  
Vol 12 (06) ◽  
pp. 637-652
Author(s):  
Y. M. Malozovsky ◽  
J. D. Fan
Keyword(s):  
Strong Coupling ◽  
Fermi Gas ◽  
Functional Derivative ◽  
Particle Interactions ◽  
Scattering Process ◽  
Vertex Part ◽  
Vertex Corrections ◽  
Coupling Case ◽  
Diagram Approach ◽  
Cooper Instability

The Cooper instability in a Fermi gas is examined using the perturbative diagram approach. A graphical functional derivative technique based on Ward's identity is developed to obtain two-particle interactions and then to calculate the vertex part. The pairing instability for a given interaction, such as a phonon (plasmon, etc.) field, occurs in a quiescent Fermi sea, i.e. without exciting or involving background particles (holes), only if the interaction is attractive, as first proposed by Cooper and adopted in the BCS (Bardeen–Cooper–Schrieffer) theory. The consequence from this technique provides a way to evaluate the effect of the vertex corrections and responses of the Fermi gas in both charge and spin channels incorporating the backward scattering process. The significance of the methodology presented in the present work lies in the fact that it can both reproduce the known results, and, more importantly, be extended to investigate the intermediate or strong coupling case, such as nuclear interactions, where a neglect of vertex corrections may not be a good approximation.

Differential polarization imaging of sickled cells

1988 ◽  
Vol 46 ◽  
pp. 62-63
Author(s):  
Marcos F. Maestre
Keyword(s):  
Optical Properties ◽  
Theoretical Approach ◽  
Polarized Light ◽  
Polarization Microscopy ◽  
Spectroscopic Techniques ◽  
Polarization Imaging ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Microscopic Scale ◽  
Chiral Structures

Recently we have developed a form of polarization microscopy that forms images using optical properties that have previously been limited to macroscopic samples. This has given us a new window into the distribution of structure on a microscopic scale. We have coined the name differential polarization microscopy to identify the images obtained that are due to certain polarization dependent effects. Differential polarization microscopy has its origins in various spectroscopic techniques that have been used to study longer range structures in solution as well as solids. The differential scattering of circularly polarized light has been shown to be dependent on the long range chiral order, both theoretically and experimentally. The same theoretical approach was used to show that images due to differential scattering of circularly polarized light will give images dependent on chiral structures. With large helices (greater than the wavelength of light) the pitch and radius of the helix could be measured directly from these images.

Historic memory and propaganda. A theoretical approach to the communicative study of memory

2016 ◽  
Vol 0 (26) ◽  
pp. 71-94 ◽  
Author(s):  
Miguel Vázquez Liñán ◽  
◽  
Salvador Leetoy ◽  
Keyword(s):  
Theoretical Approach ◽  
Historic Memory

Toxic Leadership in the Military Organization – A Theoretical Approach to Failed Leadership

2020 ◽  
Vol 26 (1) ◽  
pp. 182-185
Author(s):  
Alexandru Baboș ◽  
Raluca Rusu
Keyword(s):  
Cultural Differences ◽  
Theoretical Approach ◽  
Personal Characteristics ◽  
Toxic Leadership ◽  
Military Organization ◽  
The Military

AbstractThe toxic leadership refers to destructive behaviours and leaders’ personal characteristics which cause serious damage to the subordinates and organizations. Still, what is toxic for the military in one country can be good in another one, given the cultural differences. This article wants to emphasize, from a theoretical approach, the main characteristics and effects of toxic leadership within the military organization.

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