Fractional Quantum Hall Effect Measurements at Zero g-Factor

A.N. Utjuzh; C.T. Foxon; D.K. Maude; D.R. Leadley; J.C. Portal; J.J. Harris; R.J. Nicholas

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arxiv cond-mat/9706157 v1 pith:V2XXCTH7 submitted 1997-06-16 cond-mat.mes-hall

Fractional Quantum Hall Effect Measurements at Zero g-Factor

D.R. Leadley , R.J. Nicholas , D.K. Maude , A.N. Utjuzh , J.C. Portal , J.J. Harris , C.T. Foxon This is my paper

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Fractional quantum Hall effect energy gaps have been measured in GaAs/GaAlAs heterojunctions as a function of Zeeman energy, which is varied by applying hydrostatic pressure up to 20 kbar. The gap at v=1/3 decreases with pressure until the g-factor changes sign when it again increases. The behavior is similar to that seen at v=1 and shows that excitations from the 1/3 ground state can be spin-like in character. At small Zeeman energy, the excitation appears to consist of 3 spins and may be interpreted as a small composite skyrmion.

Fractional Quantum Hall Effect Measurements at Zero g-Factor

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