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- W122264606 abstract "Extended electronic systems (crystals, polymers, etc.) can be conveniently described using the language of the quantum field theory1,2. In this approach one treats the ground state of a system as a “vacuum” with respect to which quasiparticles, representing excited states, are defined. A quasiparticle is characterized by its energy and, usually, by some symmetry labels such as wave vector, spin, charge, etc. When an extended system is studied within the Born-Oppenheimer approximation (i.e., it is assumed that the electrons are decoupled from the phonons) the basic quasiparticles are “electrons” and “holes” (the quotation marks are used here to distinguish between quasiparticles and free particles), treated as elementary particles corresponding to the Fermi-Dirac statistics. Depending on the system studied other quasiparticles: excitons, plasmons, or magnons may also appear." @default.
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- W122264606 date "1989-01-01" @default.
- W122264606 modified "2023-09-23" @default.
- W122264606 title "Quasiparticles in Extended Systems — A Coupled-Cluster Approach" @default.
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