title: Splitting of long-wavelength modes of the fractional quantum hall liquid at nu = 1/3.
abstract: Resonant inelastic light scattering experiments at nu = 1/3 reveal a novel splitting of the long-wavelength modes in the low energy spectrum of quasi-particle excitations in the charge degree of freedom. We find a single peak at small wave vectors that splits into two distinct modes at larger wave vectors. The evidence of well-defined dispersive behavior at small wave vectors indicates a coherence of the quantum fluid in the micron length scale. We evaluate interpretations of long-wavelength modes of the electron liquid.
authors.affiliation: Department of Physics, Columbia University, New York, New York 10027, USA.
authors.forename: C F
authors.initials: CF
authors.lastname: Hirjibehedin
authors.forename: Irene
authors.initials: I
authors.lastname: Dujovne
authors.forename: A
authors.initials: A
authors.lastname: Pinczuk
authors.forename: B S
authors.initials: BS
authors.lastname: Dennis
authors.forename: L N
authors.initials: LN
authors.lastname: Pfeiffer
authors.forename: K W
authors.initials: KW
authors.lastname: West