Phonon Absorption at the Magneto-Roton Minimum in the Fractional Quantum Hall Effect
arXiv:cond-mat/9408034 · doi:10.1103/PhysRevLett.74.2339
Abstract
We have made the first phonon absorption measurements in the fractional quantum Hall régime. Experiments have been conducted on two samples which have similar electron densities but greatly differing mobilities. The energy gaps as measured by activation studies of the longitudinal resistance differ by a factor of two. Phonon absorption measurements give almost identical values for the energy gap demonstrating that the gap measured in this way is rather insensitive to disorder. The value of this gap is in agreement with the activation gap measured in the high mobility sample. Values obtained at are in good agreement with theory.
12 pages. Typeset using RevTex. Report Number NU-PH-032
References in corpus (1)
Cited by in corpus (25)
- Magneto-roton excitation of fractional quantum Hall effect: Comparison between theory and experiment
- Inelastic Light Scattering by Gap Excitations of Fractional Quantum Hall States at 1/3 <= ν<= 2/3
- Composite fermion theory of collective excitations in fractional quantum Hall effect
- Acoustic Wave Absorption as a Probe of Dynamical Geometrical Response of Fractional Quantum Hall Liquids
- Excitons of Composite Fermions
- Two-phonon scattering of magnetorotons in fractional quantum Hall liquids
- Tuning gaps and phases of a two-subband system in a quantizing magnetic field
- Study of Low Energy Spin Rotons in the Fractional Quantum Hall Effect
- Positions of the magnetoroton minima in the fractional quantum Hall effect
- Magneto-roton excitation in a holographic quantum Hall fluid
- Mixed States of Composite Fermions Carrying Two and Four Vortices
- Fluctuations of a holographic quantum Hall fluid
- Interacting composite fermions: Nature of the 4/5, 5/7, 6/7, and 6/17 fractional quantum Hall states
- A theory of phonon spectroscopy in the fractional quantum Hall regime
- Analytic Wavefunctions for Neutral Bulk Excitations in Fractional Quantum Hall Fluids
- Shape of the magnetoroton at and in real samples
- Specific Heat of a Fractional Quantum Hall System
- Splitting of Girvin-MacDonald-Platzman density wave and the nature of chiral gravitons in fractional quantum Hall effect
- Static structure factor and the dispersion of the Girvin-MacDonald-Platzman density mode for fractional quantum Hall fluids on the Haldane sphere
- Magnetoroton scattering by phonons in the fractional quantum Hall regime
- Two-subband system in quantizing magnetic field: Probing many-body gap by non-equilibrium phonons
- Interband absorption and luminescence in small quantum dots under strong magnetic fields
- Three-point density correlation functions in the fractional quantum Hall regime
- Phonon Excitations of Composite Fermion Landau Levels
- Non linear conductivity and collective charge excitations in the lowest Landau level