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Signatures of spin in the v=1/3 fractional quantum Hall effect

By A. F. Dethlefsen, E. Mariani, H. P. Tranitz, W. Wegscheider and R. J. Haug


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

Topics: Electron mobility, Electron spin polarisation, Ferromagnetism, Ground states, Quantum Hall effect, Two-dimensional electron gas, 0204 Condensed Matter Physics, 0206 Quantum Physics
Publisher: American Physical Society
Year: 2006
DOI identifier: 10.1103/PhysRevB.74.165325
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