Gapped Excitations of unconventional FQHE states in the Second Landau Level

Abstract

We report the observation of low-lying collective charge and spin excitations in the second Landau level at ν = 2 + 1/3 and also for the very fragile states at ν = 2 + 2/5, 2 + 3/8 in inelastic light scattering experiments. These modes exhibit a clear dependence on filling factor and temperature substantiating the unique access to the characteristic neutral excitation spectra of the incompressible FQHE states. A detailed mode analysis reveals low energy modes at around 70 μeV and a sharp mode slightly below the Zeeman energy interpreted as gap and spin wave excitation, respectively. The lowest energy collective charge excitation spectrum at ν = 2 + 1/3 exhibits significant similarities and a universal scaling of the energies with its cousin state in the lowest Landau level at ν = 1/3 suggesting similar underlying physics. The observed excitation spectra facilitate to distinguish between theoretical descriptions of the nature of those FQHE states. A striking polarization dependence in light scattering is discussed in the framework of anisotropic electron phases that allow for the stabilization of nematic FQHE states.

References in corpus (8)

• Experimental studies of the fractional quantum Hall effect in the first excited Landau level
• Fractional Quantum Hall Hierarchy and the Second Landau Level
• Tilt-Induced Anisotropic to Isotropic Phase Transition at $\nu =5/2$
• Evidence for a $\nu =5/2$ Fractional Quantum Hall Nematic State in Parallel Magnetic Fields
• Role of exciton screening in the 7/3 fractional quantum Hall effect
• Splitting of Long-Wavelength Modes of the Fractional Quantum Hall Liquid at $\nu =1/3$
• Soft Spin Wave Near nu=1: Evidence for a Magnetic Instability in Skyrmion Systems
• Anomalous Gap Reversal of the $3+1/3$ and $3+1/5$ Fractional Quantum Hall States

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• Analytic exposition of the graviton modes in fractional quantum Hall effects and its physical implications
• Shape of the magnetoroton at $\nu =1/3$ and $\nu =7/3$ in real samples
• Collective electronic excitation in a trapped ensemble of photogenerated dipolar excitons and free holes revealed by inelastic light scattering
• Fractional Quantum Hall States of the $\mathcal{A}$ phase in the Second Landau Level
• Possible continuous transition from fractional quantum Hall to stripe phase at ${\nu }_e=7/3$
• Domain Textures in the Fractional Quantum Hall Effect
• Observation of new plasmons in the fractional quantum Hall effect: interplay of topological and nematic orders