Transport gap in a nu=1/3 quantum Hall system: a probe for skyrmions

Details Transport gap in a nu=1/3 quantum Hall system: a probe for skyrmions Transport gap in a nu=1/3 quantum Hall system: a probe for skyrmions

2006-03-17

arxiv.org/abs/cond-mat/0603455v1

Phys. Rev. B 74, 195324 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

submitted to PRB

Scientific paper

10.1103/PhysRevB.74.195324

The dependence of the activated gap on magnetic field is studied for the fractional filling factor~1/3. By comparing the experimental results with results from exact diagonalization calculations we are able to identify the excitation of a small antiskyrmion in the low-field regime and a cross-over to spinless excitations at higher magnetic fields. The effect of sample quality is studied. On the side of the theory, comparison between different geometries (torus and sphere) and different sizes is carried out. Under inclusion of Landau level mixing and finite thickness, we obtain a good agreement between calculated energies and experimental results.

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