On ground states of interacting Composite Fermions with spin at half filling

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dc.creatorMerlo, Matteo
dc.creatorMagnoli, Nicodemo
dc.creatorSassetti, Maura
dc.creatorKramer, Bernhard
dc.date2003-12-28
dc.date.accessioned2026-07-07T06:25:04Z
dc.date.available2026-07-07T06:25:04Z
dc.descriptionThe effects of interactions in a 2D electron system in a strong magnetic field of two degenerate Landau levels with opposite spins and at filling factors 1/2 are studied. Using the Chern-Simons gauge transformation, the system is mapped to Composite Fermions. The fluctuations of the gauge field induce an effective interaction between the Composite Fermions which can be attractive in both the particle-particle and in the particle-hole channel. As a consequence, a spin-singlet (s-wave) ground state of Composite Fermions can exist with a finite pair-breaking energy gap for particle-particle or particle-hole pairs. The competition between these two possible ground states is discussed. For long-range Coulomb interaction the particle-particle state is favored if the interaction strength is small. With increasing interaction strength there is a crossover towards the particle-hole state. If the interaction is short range, only the particle-particle state is possible.
dc.descriptionREVTEX; 12 pages, 5 figures; submitted to Phisical Review B
dc.identifierhttps://arxiv.org/abs/cond-mat/0312666
dc.identifierhttp://arxiv.org/abs/cond-mat/0312666
dc.identifierRevised version published in Physical Review B 71, 155307 (2005).
dc.identifierdoi:10.1103/PhysRevB.71.155307
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/96747
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStrongly Correlated Electrons
dc.titleOn ground states of interacting Composite Fermions with spin at half filling
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