J. Phys. IV France 10 (2000) Pr3-169-Pr3-175
Topological character of excitations in strongly correlated electronic systems : Confinement and dimensional crossoverS. Brazovskii
Laboratoire de Physique Théorique et des Modèles Statistiques, CNRS, bâtiment 100, Univeristé Paris-Sud, 91405 Orsay Cedex, France e-mail : firstname.lastname@example.org & http://ipnweb.in2p3.fr/lptms/membres/brazov/.
Topologically nontrivial states are common in symmetry broken phases at macroscopic scales. Low dimensional systems bring them to a microscopic level where solitons emerge as elementary excitations. After a history introduction, we shall discuss the topological aspects of elementary excitations, especially the confinement and the dimensional D crossover. At higher D the topological requirements for the combined symmetry originate the spin- or charge-roton like excitations with charge- or spin- kinks localized in the core. In quasi 1D world they can be viewed as resulting from a spin-charge recombination due to the 3D confinement.
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