Composite Fermions with Spin at $ν=1/2$

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dc.creatorKramer, B.
dc.creatorMagnoli, N.
dc.creatorMariani, E.
dc.creatorMerlo, M.
dc.creatorNapoli, F.
dc.creatorSassetti, M.
dc.date2002-12-17
dc.date.accessioned2026-07-07T02:48:48Z
dc.date.available2026-07-07T02:48:48Z
dc.descriptionThe 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 $ν=1/2$. 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.
dc.descriptionto be published in proceedings of Varenna Summer School "E. Fermi": Course CLI "Quantum phenomena in mesoscopic systems", July 2002
dc.identifierhttps://arxiv.org/abs/cond-mat/0212423
dc.identifierhttp://arxiv.org/abs/cond-mat/0212423
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/20553
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleComposite Fermions with Spin at $ν=1/2$
dc.typetext

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