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Large skyrmions in an Al 0.13 Ga 0.87 As quantum well

2000; American Physical Society; Volume: 61; Issue: 7 Linguagem: Inglês

10.1103/physrevb.61.4469

1095-3795

Sudhanshu Shukla, M. Shayegan, S. R. Parihar, S. A. Lyon, Nigel R. Cooper, A. A. Kiselev,

Physics of Superconductivity and Magnetism

We report tilted-field magnetotransport measurements of two-dimensional electron systems in a 200 Angstrom-wide Al(0.13)Ga(0.87)As quantum well. We extract the energy gap for the quantum Hall state at Landau level filling \nu =1 as a function of the tilt angle. The relatively small effective Lande g-factor (g ~ 0.043) of the structure leads to skyrmionic excitations composed of the largest number of spins yet reported (s ~ 50). Although consistent with the skyrmion size observed, Hartree-Fock calculations, even after corrections, significantly overestimate the energy gaps over the entire range of our data.