title: Half-polarized quantum hall states.
abstract: We report a theoretical analysis of the half-polarized quantum Hall states observed in a recent experiment. Our numerical results indicate that the ground state energy of the quantum Hall nu = 2 / 3 and nu = 2 / 5 states versus spin polarization has a downward cusp at half the maximal spin polarization. We map the two-component fermion system onto a system of excitons and describe the ground state as a liquid state of excitons with nonzero values of exciton angular momentum.
authors.affiliation: Max-Planck-Institut fur Physik Komplexer Systeme, Dresden, Germany.
authors.forename: V M
authors.initials: VM
authors.lastname: Apalkov
authors.forename: T
authors.initials: T
authors.lastname: Chakraborty
authors.forename: P
authors.initials: P
authors.lastname: Pietiläinen
authors.forename: K
authors.initials: K
authors.lastname: Niemelä