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dc.contributor.authorKramer, B
dc.contributor.authorMagnoli, N
dc.contributor.authorMariani, E
dc.contributor.authorMerlo, M
dc.contributor.authorNapoli, F
dc.contributor.authorSassetti, M
dc.date.accessioned2016-03-10T16:59:57Z
dc.date.issued2003
dc.description.abstractThe model of Composite Fermions for describing interacting electrons in two dimensions in the presence of a magnetic field is described. In this model, charged Fermions are combined with an even number of magnetic flux quanta in such a way that the external magnetic field is compensated on the average for half filling of Landau levels and the interaction is incorporated into an effective mass of the new composite particles. The fluctuations of the Chern-Simons gauge field, which describes formally the flux attachment, induce new interactions between the Composite Fermions. The effective interaction is investigated with particular emphasis on the role of the electron spin at filling factor $\nu=1/2$. For a system with equal numbers of spin-up and spin-down electrons it is found that the dominant effective interaction is attractive in the spin-singlet channel. This can induce a ground state consisting of Cooper pairs of Composite Fermions that is separated from the excited states by a gap. The results are used to understand recent spin polarization measurements done in the region of the Fractional Quantum Hall Effect at different constant filling factors.en_GB
dc.description.sponsorshipAcknowledgment This work has been supported by the European Union via the TMR and RTN programmes (FMRX-CT98-0180, HPRN-CT2000-00144), by the Deutsche Forschungsgemeinschaft within the Schwerpunkt “Quanten-Hall-Effekt” of the Universit¨at Hamburg, and by the Italian MURST via PRIN00.en_GB
dc.identifier.citationB. Kramer, E. Mariani, N. Magnoli, M. Merlo, F. Napoli, M. Sassetti, (2003) in Composite Fermions with spin at ν = 1/2, pp. 395-415 in Proceedings of the International School of Physics "Enrico Fermi"; Volume 151: Quantum Phenomena in Mesoscopic Systems.en_GB
dc.identifier.doi10.3254/978-1-61499-007-9-395
dc.identifier.urihttp://hdl.handle.net/10871/20659
dc.language.isoenen_GB
dc.publisherIOS Pressen_GB
dc.relation.urlhttp://arxiv.org/abs/cond-mat/0212423v1en_GB
dc.rights© Societa Italiana di Fisicaen_GB
dc.subjectcond-mat.mes-hallen_GB
dc.subjectcond-mat.mes-hallen_GB
dc.subjectcond-mat.str-elen_GB
dc.titleComposite Fermions with Spin at $ν=1/2$en_GB
dc.typeConference paperen_GB
dc.date.available2016-03-10T16:59:57Z
dc.identifier.isbn978-1-58603-384-2
dc.identifier.issn0074-784X
dc.descriptionto be published in proceedings of Varenna Summer School "E. Fermi": Course CLI "Quantum phenomena in mesoscopic systems", July 2002en_GB
dc.descriptionThis is the author accepted manuscript. The final version is available from IOS press via the DOI in this record.en_GB
dc.identifier.journalProceedings- International School of Physics Enrico Fermien_GB


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