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Signatures of spin in the ν=1∕3 fractional quantum Hall effect

DOI to cite this document:
Dethlefsen, A. F. ; Mariani, E. ; Tranitz, Hans-Peter ; Wegscheider, Werner ; Haug, R. J.
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Date of publication of this fulltext: 25 Jan 2010 13:18


The activation gap Δ of the fractional quantum Hall state at constant filling ν=1∕3 is measured in a wide range of perpendicular magnetic field B. Despite the full spin polarization of the incompressible ground state, we observe a sharp crossover between a low-field linear dependence of Δ on B and a Coulomblike square root behavior at large B. From the global gap reduction we get information about the mobility edges in the fractional quantum Hall regime.

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