Research Article

Quasi-Particle Properties from Tunneling in the v = 5/2 Fractional Quantum Hall State

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Science  16 May 2008:
Vol. 320, Issue 5878, pp. 899-902
DOI: 10.1126/science.1157560

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Quasi-particles with fractional charge and statistics, as well as modified Coulomb interactions, exist in a two-dimensional electron system in the fractional quantum Hall (FQH) regime. Theoretical models of the FQH state at filling fraction Math make the further prediction that the wave function can encode the interchange of two quasi-particles, making this state relevant for topological quantum computing. We show that bias-dependent tunneling across a narrow constriction at Math exhibits temperature scaling and, from fits to the theoretical scaling form, extract values for the effective charge and the interaction parameter of the quasi-particles. Ranges of values obtained are consistent with those predicted by certain models of the Math state.

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