title: Spin texture and magnetoroton excitations at nu=1/3.
abstract: Neutral spin texture (ST) excitations at nu=1/3 are directly observed for the first time by resonant inelastic light scattering. They are determined to involve two simultaneous spin flips. At low magnetic fields, the ST energy is below that of the magnetoroton minimum. With increasing in-plane magnetic field these mode energies cross at a critical ratio of the Zeeman and Coulomb energies of eta(c)=0.020+/-0.001. Surprisingly, the intensity of the ST mode grows with temperature in the range in which the magnetoroton modes collapse. The temperature dependence is interpreted in terms of a competition between coexisting phases supporting different excitations. We consider the role of the ST excitations in activated transport at nu=1/3.
authors: Physics & Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA. jgg@phys.columbia.edu
authors: Javier G
authors: JG
authors: Groshaus
authors: Irene
authors: I
authors: Dujovne
authors: Yann
authors: Y
authors: Gallais
authors: Cyrus F
authors: CF
authors: Hirjibehedin
authors: Aron
authors: A
authors: Pinczuk
authors: Yan-Wen
authors: YW
authors: Tan
authors: Horst
authors: H
authors: Stormer
authors: Brian S
authors: BS
authors: Dennis
authors: Loren N
authors: LN
authors: Pfeiffer
authors: Ken W
authors: KW
authors: West