quasi-particle


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quasi-particle

[¦kwä·zē ¦pard·ə·kəl]
(physics)
An entity used in the description of a system of many interacting particles which has particlelike properties such as mass, energy, and momentum, but which does not exist as a free particle; examples are phonons and other elementary excitations in solids, and “dressed” helium-3 atoms in Landau's theory of liquid helium-3.
References in periodicals archive ?
The creation operator [d.sup.[??].sub.ps] of a quasi-particle corresponds to the creation of a one-electron hole in the Fermi sphere if [absolute value of p] < [p.sub.0] and the creation of a one-electron occupied state if [absolute value of p] > [p.sub.0].
where M(V) is the velocity-dependent "mass" of the said quasi-particle, and inertial motion requires the vanishing of the right-hand side, here written symbolically as the difference ("jump") between the values of a driving force between plus and minus infinity, again defined in terms of the value of the "Eshelby stress" at infinities.
Let us now discuss the real and imaginary part of the potential modified using the above define Re [D.sup.00.sub.11]([omega], p) and Im [D.sup.00.sub.11]([omega], p) along with effective fugacity quasi-particle model (EQPM) in the next subsections.
Now, due to transmission of these quasi-particles Dirac fermions, a transition from central band to side-bands at energies [11,17] E [+ or -] n[??][omega], where n is an integer with values 0, [+ or -] 1, [+ or -] 2,....
where [SIGMA] represents the one-loop quark quasi-particle self-energy, and the LO correction is given as [34]
In the letter [9], the boundary wave number [k.sub.0] = mc/h for electromagnetic field in vacuum was appeared by suggestion that the light quasi-particles interact with each other by repulsive potential [U.sub.[??]] in momentum space
Shillady introduced in 1999 a new model of the H2-molecule [1, 2], in which the two valence electrons are deeply bounded-correlated into a single quasi-particle they called isoelectronium that is permitted by the covering hadronic chemistry [3a].
We will investigate the structure of quasi-particle excitations of this superfluid, which should exhibit edge modes described as Majorana fermions.
We are interested primarily in extended spectroscopic studies of electronic states at surfaces of these materials and in particular quasi-particle interference.
Found experimentally only inside materials as so-called quasi-particles, they behave like particles which have no mass.
Electrons with half-integer values of their spin are part of this <<Laughlin>> quantum fluid, and occurring in her excitement starting to behave like quasi-particles with integer spin (as bosons) [18-21].
Wave Momentum and Quasi-Particles in Physical Acoustics