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Topic: Quasiparticle

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	Quasiparticle - Wikipedia, the free encyclopedia
		The quasiparticle concept is one of the most important in condensed matter physics, because it is one of the few known ways of simplifying the quantum mechanical many-body problem, and is applicable to an extremely wide range of many-body systems.
		In the language of many-body quantum mechanics, a quasiparticle is a type of low-lying excited state of the system (a state possessing energy very close to the ground state energy) that is known as an elementary excitation.
		It turns out that the interactions between quasiparticles become negligible at sufficiently low temperatures, in which case we can obtain a great deal of information about the system as a whole, including the flow properties and heat capacity, by investigating the properties of individual quasiparticles.
	en.wikipedia.org /wiki/Quasiparticle (331 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		One-particle wave functions and energies from Kohn-Sham calculations with the exact local Kohn-Sham exchange and the local density approximation (LDA) correlation potential[EXX(c)] are used as input for quasiparticle calculations in the GW approximation (GWA) for eight semiconductors.
		Quasiparticle corrections to EXX(c) band gaps are small when EXX(c) band gaps are close to experiment.
		In the case of diamond, quasiparticle calculations are essential to remedy a 0.7 eV underestimate of the experimental band gap within EXX(c).
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=20217698 (299 words)

	Materials Science: Review of Quasiparticle Calculations (Site not responding. Last check: 2007-10-29)
		During the last decade, quasiparticle calculations have been used successfully to describe the electronic excited-state properties of solids such as single-particle band structures and absorption spectra.
		A successful approximation for the determination of excited states is based on the quasiparticle concept and the Green function method.
		The mathematical description of quasiparticles is based on the single-particle Green function G, whose exact determination requires complete knowledge of the quasiparticle self-energy.
	www.physics.ohio-state.edu /~aulbur/gw/review.html (304 words)

	Citebase - HTL quasiparticle models of deconfined QCD at finite chemical potential
		Authors: Rebhan, A. Romatschke, P. Using quasiparticle models and imposing thermodynamic consistency, lattice data for the equation of state of deconfined QCD can be mapped to finite chemical potential.
		We consider a refinement of existing simple massive quasiparticle models using the non-local hard-thermal-loop (HTL) propagators, and certain NLO corrections thereof, to obtain the thermodynamic potential as a function of temperature and chemical potential.
		A quasiparticle description of the thermodynamics of deconfined matter, reproducing both the perturbative limit and nonperturbative lattice QCD data at finite temperature, is generalized to finite chemical potential.
	www.citebase.org /cgi-bin/citations?id=oai:arXiv.org:hep-ph/0304294 (1442 words)

	Quasiparticle Behavior in Bose Quantum Liquids
		The study of quasiparticles, which govern the properties of quantum liquids, was pioneered by Russian Nobel Prize winning-physicist L.D. Landau.
		There are two types of quasiparticles, Bose and Fermi, and physicists around the globe are exploring the properties of each type.
		The Brookhaven experiments, conducted using the triple-axis neutron spectrometer at the National Institutes of Standards and Technology, confirmed that in a particular Bose quantum spin liquid, quasiparticle decay leads to spectrum termination, as was predicted by Landau.
	www.bnl.gov /bnlweb/pubaf/pr/PR_display.asp?prID=05-26 (626 words)

	Birth of a 'Quasiparticle' in Silicon
		The Pitt experiment triggered the birth of a "quasiparticle," an entity in the strange world of quantum mechanics, the physical principles that hold sway at atomic scale.
		Petek believes this quasiparticle has properties that could be exploited to improve electronic devices.
		Petek said that the control of silicon devices via lasers could lead to transistors which will be 1,000 faster than current ones.
	www.primidi.com /2003/11/14.html (345 words)

	Quasiparticle Behavior In Bose Quantum Liquids
		From Matter Waves To A Crystal Of Atoms And Back (January 11, 2002) -- Researchers at the Max-Planck-Institute for Quantum Optics in Garching and at the Ludwig-Maximilians University of Munich have observed a phase transition between two dramatically different states of...
		First Observation Of A New Quantum Gas (September 10, 1999) -- Researchers at the National Institute of Standards and the University of Colorado at Boulder report the achievement of the first Fermi degenerate gas of atoms.
		Global Team Of Physicists Upends Standard Model With Discovery Of Neutrino Oscillation, Mass (July 9, 2004) -- A team of nearly 100 physicists from around the world have achieved results verifying that the elementary particle known as the neutrino exhibits a distinctive pattern of oscillation.
	www.sciencedaily.com /releases/2005/03/050326012711.htm (676 words)

	Imaging Quasiparticle Inteference in Bi2Sr2CaCu2O8+δ
		Images of these energy-dependent modulations are Fourier analyzed to yield the dispersion of their wavevectors.
		Comparison of the dispersions with photoemission spectroscopy data indicates that quasiparticle interference, due to elastic scattering between characteristic regions of momentum-space, provides a consistent explanation for the conductance modulations, without appeal to another order parameter.
		These results refocus attention on quasiparticle scattering processes as potential explanations for other incommensurate phenomena in the cuprates.
	people.ccmr.cornell.edu /~jcdavis/stm/papers/qi (145 words)

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