title: Spectroscopic evidence for the localization of Skyrmions near nu = 1 as T --> 0.
abstract: Optically pumped nuclear magnetic resonance measurements of 71Ga spectra were carried out in an n-doped GaAs/Al(0.1)Ga0.9As multiple quantum well sample near the integer quantum Hall ground state nu = 1. As the temperature is lowered (down to T approximately 0.3 K), a "tilted plateau" emerges in the Knight shift data, which is a novel experimental signature of quasiparticle localization. The dependence of the spectra on both T and nu suggests that the localization is a collective process. The frozen limit spectra appear to rule out a 2D lattice of conventional Skyrmions.
authors.affiliation: Department of Physics, Yale University, New Haven, Connecticut 06511, USA.
authors.forename: P
authors.initials: P
authors.lastname: Khandelwal
authors.forename: A E
authors.initials: AE
authors.lastname: Dementyev
authors.forename: N N
authors.initials: NN
authors.lastname: Kuzma
authors.forename: S E
authors.initials: SE
authors.lastname: Barrett
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: West