title: Missing 2k(F) response for composite fermions in phonon drag
abstract: The response of composite fermions to large wave vector scattering has been studied through phonon drag measurements. While the response retains qualitative features of the electron system at zero magnetic field, notable discrepancies develop as the system is varied from a half-filled Landau level by changing density or field. These deviations, which appear to be inconsistent with the current picture of composite fermions, are absent if half filling is maintained while changing density. There remains, however, a clear deviation from the temperature dependence anticipated for 2k(F) scattering.
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.initials: S
authors.lastname: Zelakiewicz
authors.initials: H
authors.lastname: Noh
authors.initials: TJ
authors.lastname: Gramila
authors.initials: LN
authors.lastname: Pfeiffer
authors.initials: KW
authors.lastname: West