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  • Title: Quasi-particle properties from tunneling in the v = 5/2 fractional quantum Hall state.
    Author: Radu IP, Miller JB, Marcus CM, Kastner MA, Pfeiffer LN, West KW.
    Journal: Science; 2008 May 16; 320(5878):899-902. PubMed ID: 18420897.
    Abstract:
    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 v = 5/2 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 v = 5/2 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 5/2 state.
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