Searches for Skyrmions in the Limit of Zero g-Factor

Abstract

Energy gaps have been measured for the ferromagnetic quantum Hall effect states at v=1 and 3 in GaAs/GaAlAs heterojunctions as a function of Zeeman energy, which is reduced to zero by applying hydrostatic pressures of up to 20kbar. At large Zeeman energy the gaps are consistent with spin wave excitations. For a low density sample the gap at v=1 decreases with increasing pressure and reaches a minimum when the g-factor vanishes. At small Zeeman energy the excitation appears to consist of a large number of reversed spins and may be interpreted as a Skyrmion. The data also suggest Skyrmionic excitations take place at v=3. The width of the minimum at v=1 is found to decrease as the g-factor is reduced in a similar way for all samples.

14 pages, 9 figures. To appear in Semiconductor Science and Technology

References in corpus (2)

• Hartree-Fock Theory of Skyrmions in Quantum Hall Ferromagnets
• Fractional Quantum Hall Effect Measurements at Zero g-Factor

Cited by in corpus (8)

• Large Skyrmions in an Al(0.13)Ga(0.87)As Quantum Well
• Activation Energy in a Quantum Hall Ferromagnet and Non-Hartree-Fock Skyrmions
• NMR Study of Large Skyrmions in Al_{0.13}Ga_{0.87}As Quantum Wells
• Spin Reversal of a Quantum Hall Ferromagnet at a Landau Level Crossing
• The Effects of Disorder on the $\nu =1$ Quantum Hall State
• Hamiltonian Theory of Disorder at 1/3
• Interaction of surface acoustic waves with a two-dimensional electron gas in the presence of spin splitting of the Landau bands
• Quantum Hall Skyrmion Lattices at $g\approx 0$