title: Dynamical disentanglement across a point contact in a non-Abelian quantum Hall state.
abstract: We analyze the tunneling of non-Abelian quasiparticles between the edges of a quantum Hall droplet at the Landau level filling fraction nu=5/2, assuming that the electrons in the first excited Landau level organize themselves in the non-Abelian Moore-Read Pfaffian state. By bosonizing the edge theory, we show that an effective spin-1/2 degree of freedom emerges in the description of a point contact. We show how the crossover from the high-temperature regime of weak quasiparticle tunneling between the edges of the droplet, with the 4-terminal Rxx approximately T(-3/2), to the low-temperature limit, with Rxx(-1/10)(h/e2) approximately-T4, is closely related to the two-channel Kondo effect. We give a physical interpretation for the entropy loss of ln(2[square root of 2) in this crossover.
authors.affiliation: Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714, USA.
authors.forename: Paul
authors.initials: P
authors.lastname: Fendley
authors.forename: Matthew P A
authors.initials: MP
authors.lastname: Fisher
authors.forename: Chetan
authors.initials: C
authors.lastname: Nayak