Fermi surface renormalization in two dimensions

2004 ◽  
Vol 408-410 ◽  
pp. 254-256 ◽  
Author(s):  
H. Freire ◽  
E. Corrêa ◽  
A. Ferraz
Keyword(s):  
Fermi Surface ◽  
Two Dimensions

scholarly journals Effect of paramagnetic fluctuations on a Fermi-surface topological transition in two dimensions

2014 ◽  
Vol 90 (16) ◽  
Author(s):  
Sergey Slizovskiy ◽  
Joseph J. Betouras ◽  
Sam T. Carr ◽  
Jorge Quintanilla
Keyword(s):  
Fermi Surface ◽  
Two Dimensions ◽  
Topological Transition

scholarly journals Catastrophe theory classification of Fermi surface topological transitions in two dimensions

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Anirudh Chandrasekaran ◽  
Alex Shtyk ◽  
Joseph J. Betouras ◽  
Claudio Chamon
Keyword(s):  
Fermi Surface ◽  
Catastrophe Theory ◽  
Two Dimensions ◽  
Topological Transitions

A product representation for cubic harmonics and special directions for the determination of the Fermi surface and related properties

1976 ◽  
Vol 54 (21) ◽  
pp. 2159-2169 ◽  
Author(s):  
W. R. Fehlner ◽  
S. H. Vosko
Keyword(s):  
Energy Density ◽  
Fermi Surface ◽  
Two Dimensions ◽  
Major Advance ◽  
Product Representation ◽  
Cubic Symmetry ◽  
One Dimensional ◽  
The One ◽  
Physical Quantities

A product representation of the fully symmetric cubic harmonics has been developed which greatly simplifies the analysis of problems involving these functions. An important example is the determination of special directions which optimize the description of various physical quantities with cubic symmetry. For example, one can obtain for a metal the Fermi energy, density of states, and details of the Fermi surface by calculation or measurement along a few special directions in the irreducible segment of the Brillouin zone. These special directions are also the basis for high-precision formulae for integration over the unit sphere of functions with full cubic symmetry. We obtain such integration formulae with a generalization to two dimensions of the one-dimensional Gauss technique. These new formulae represent a major advance in precision for with them one can determine accurately nearly as many coefficients in a cubic harmonic expansion of a physical variable as there are sample values of the variable. The integration formulae presented here should be adequate for most situations of current physical interest; if not, the method described in this paper can be used to obtain formulae with even higher precision.

The tangled web of agency

2018 ◽  
Vol 41 ◽  
Author(s):  
Alain Pe-Curto ◽  
Julien A. Deonna ◽  
David Sander
Keyword(s):  
Two Dimensions ◽  
Bad Company

AbstractWe characterize Doris's anti-reflectivist, collaborativist, valuational theory along two dimensions. The first dimension is socialentanglement, according to which cognition, agency, and selves are socially embedded. The second dimension isdisentanglement, the valuational element of the theory that licenses the anchoring of agency and responsibility in distinct actors. We then present an issue for the account: theproblem of bad company.

A transmission electron microscopic study of structural transitions in fast ionic conductors

1987 ◽  
Vol 45 ◽  
pp. 156-157
Author(s):  
R. B. Queenan ◽  
P. K. Davies
Keyword(s):  
Optical Properties ◽  
Ionic Conduction ◽  
Recent Observation ◽  
Ionic Conductivities ◽  
Sodium Aluminate ◽  
Two Dimensions ◽  
Ionic Conductors ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Trivalent Cations

Na ß“-alumina (Na1.67Mg67Al10.33O17) is a non-stoichiometric sodium aluminate which exhibits fast ionic conduction of the Na+ ions in two dimensions. The Na+ ions can be exchanged with a variety of mono-, di-, and trivalent cations. The resulting exchanged materials also show high ionic conductivities.Considerable interest in the Na+-Nd3+-ß“-aluminas has been generated as a result of the recent observation of lasing in the pulsed and cw modes. A recent TEM investigation on a 100% exchanged Nd ß“-alumina sample found evidence for the intergrowth of two different structure types. Microdiffraction revealed an ordered phase coexisting with an apparently disordered phase, in which the cations are completely randomized in two dimensions. If an order-disorder transition is present then the cooling rates would be expected to affect the microstructures of these materials which may in turn affect the optical properties. The purpose of this work was to investigate the affect of thermal treatments upon the micro-structural and optical properties of these materials.

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