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  • Title: Composite-fermion spin excitations as nu approaches 1/2: interactions in the Fermi sea.
    Author: Dujovne I, Pinczuk A, Kang M, Dennis BS, Pfeiffer LN, West KW.
    Journal: Phys Rev Lett; 2005 Jul 29; 95(5):056808. PubMed ID: 16090907.
    Abstract:
    Measurements of low-lying spin excitations by inelastic light scattering unveil a delicate balance between spin reversal and Fermi energies in the Fermi sea of composite fermions that emerges in the limit of nu --> 1/2. The interplays between these two fundamental quasiparticle interactions are uncovered in lowest spin-flip excitations in which the spin orientation and Landau level index of composite fermions change simultaneously. A collapse of the spin-flip excitation gap as nu --> 1/2 is linked to vanishing quasiparticle energy level spacings and loss of full spin polarization.
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