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We study charge excitations in quantum Hall ferromagnets realized in a symmetric quantum well. Landau levels (LLs) with different subband and orbital indices crossing at the Fermi level act as up and down pseudospin levels. The activation energy measured as a function of the pseudospin Zeeman energy, ΔZ, reveals easy-plane and easy-axis ferromagnetism for LL filling of ν0ex0ex=0ex0ex3 and 4, respectively, for which the crossing levels have parallel and antiparallel spin. For ν0ex0ex=0ex0ex4, we observe a sharp reduction in the gap for ΔZ→0, which we discuss in terms of a topological excitation in domain walls akin to Skyrmions.
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Muraki et al. (2001) studied this question.
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