Soft Spin Wave Near nu=1: Evidence for a Magnetic Instability in Skyrmion Systems

Abstract

The ground state of the two dimensional electron gas near $\nu$=1 is investigated by inelastic light scattering measurements carried down to very low temperatures. Away from $\nu$=1, the ferromagnetic spin wave collapses and a new low-energy spin wave emerges below the Zeeman gap. The emergent spin wave shows soft behavior as its energy increases with temperature and reaches the Zeeman energy for temperatures above 2 K. The observed softening indicates an instability of the two dimensional electron gas towards a magnetic order that breaks spin rotational symmetry. We discuss our findings in light of the possible existence of a Skyrme crystal.

arXiv comment4 pages, 4 figures, to appear in Phys. Rev. Lett

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Cited by in corpus (26)

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• Rapid collapse of spin waves in non-uniform phases of the second Landau level
• Anomalous structure in the single particle spectrum of the fractional quantum Hall effect
• Optical absorption to probe the quantum Hall ferromagnet at filling factor $\nu =1$
• Extra Spin-Wave mode in Quantum Hall systems. Beyond the Skyrmion Limit
• Slow spin relaxation in a quantum Hall ferromagnet state
• Pinning mode resonance of a Skyrme crystal near Landau level filling factor $\nu$=1
• Competing Hyperfine and Spin-Orbit Couplings: Spin Relaxation in a Quantum Hall Ferromagnet
• Enhancement of the $\nu =5/2$ Fractional Quantum Hall State in a Small In-Plane Magnetic Field
• Melting of hexagonal Skyrmion states in chiral magnets
• Gapped Excitations of unconventional FQHE states in the Second Landau Level
• Optical emission spectroscopy study of competing phases of electrons in the second Landau level
• Goldstone mode stochastization in quantum Hall ferromagnet
• Goldstone Mode Relaxation in a Quantum Hall Ferromagnet due to Hyperfine Interaction with Nuclei
• Optical excitations in compressible and incompressible two-dimensional electron liquids
• Riemann meets Goldstone: magnon scattering off quantum Hall skyrmion crystals probes interplay of symmetry breaking and topology
• Spin-Wave Relaxation in a Quantum Hall Ferromagnet
• RD-NMR spectra of the crystal states of the two-dimensional electron gas in a quantizing magnetic field
• Disorder Enhanced Nuclear Spin Relaxation at Landau Level Filling Factor One
• Thermal Activation Signatures of the Anderson Insulator and the Wigner Solid forming near $\nu =1$
• Domain Textures in the Fractional Quantum Hall Effect
• Network architecture of energy landscapes in mesoscopic quantum systems
• Spin-rotation mode in a quantum Hall ferromagnet
• Spontaneous Transition to a Correlated Phase of Skyrmions Observed in Real Space
• Damping via the hyperfine interaction of a spin-rotation mode in a two-dimensional strongly magnetized electron plasma