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  • Title: New phase transition between partially and fully polarized quantum Hall states with charge and spin gaps at nu = 2/3.
    Author: Freytag N, Tokunaga Y, Horvatić M, Berthier C, Shayegan M, Lévy LP.
    Journal: Phys Rev Lett; 2001 Sep 24; 87(13):136801. PubMed ID: 11580614.
    Abstract:
    The average electron spin polarization Rho of a two-dimensional electron gas confined in GaAs/GaAlAs multiple quantum wells was measured by NMR near the fractional quantum Hall state with filling factor nu = 2/3. Above this filling factor (2/3< or = nu < 0.85), a strong depolarization is observed corresponding to two spin flips per additional flux quantum. The most remarkable behavior of the polarization is observed at nu = 2/3, where a quantum phase transition from a partially polarized (Rho approximately 3/4) to a fully polarized (Rho = 1) state can be driven by increasing the ratio between the Zeeman and the Coulomb energy above a critical value eta(c) = Delta(Z)/Delta(C) = 0.0185.
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