Unpolarized quasielectrons and the spin polarization at filling fractions between 1/3 and 2/5
Abstract
We prove that for a hard core interaction the ground state spin polarization in the low Zeeman energy limit is given by P=2/-5 for filling fractions in the range 1/3 ≤≤ 2/5 . The same result holds for a Coulomb potential except for marginally small magnetic fields. At the magnetic fields B<20T unpolarized quasielectrons can manifest themselves by a characteristic peak in the I-V characteristics for tunneling between two =1/3 ferromagnets.
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