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 ?
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[?
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.
The main hypothesis of the model describes how the valence electrons become involved in a binding process when they are at very short distance giving rise to a new state or quasi-particle, called isoelectronium.
Based on the work of Leon Brillouin and Emmy Noether, this book explores a novel approach to understanding physical acoustics that incorporates wave momentum and quasi-particles.
This solution was re-presented using a variety of alternative mathematical tools, from the more familiar spinors to Pfaffians and quasi-particles, the latter signalling a return to the algebraic approach.
They were cited for their discovery of the fractional quantum-hall effect, a new state of matter created when electrons come together to form quasi-particles with exact fractions of electrical charges.
Brockhouse actually created a new trend in the field of neutron physics associated with the measurement of spectra of fast and slow neutrons and other elementary particles, including the quasi-particles (photons) [21, 23].
Expert contributors cover such topics as progress in fast ignition, fusion targets, fundamentals of ICF Hohlraums, direct-drive inertial fusion and the acceleration of photons and quasi-particles.
Specifically, weak correlation will be captured using Coupled Cluster-type approaches, excited states are accessible through an Equation-of-Motion formalism, and open-shell extensions will use generalized quasi-particles as building blocks for the electronic wavefunction.
They predicted the existence of light quasi-particles bearing spin equal to 1, and a finite effective mass m = 2.
Indirect excitons are boson-like quasi-particles which exhibit a very long lifetime and a well defined electric dipole.