title: Enhanced Bulk-Edge Coulomb Coupling in Fractional Fabry-Perot Interferometers.
abstract: Recent experiments use Fabry-Perot (FP) interferometry to claim that the ν=5/2 quantum Hall state exhibits non-Abelian topological order. We note that the experiments appear inconsistent with a model neglecting bulk-edge Coulomb coupling and Majorana tunneling, so we reexamine the theory of FP devices. Even a moderate Coulomb coupling may strongly affect some fractional plateaus, but very weakly affect others, allowing us to model the data over a wide range of plateaus. While experiments are consistent with the ν=5/2 state harboring Moore-Read topological order, they may have measured Coulomb effects rather than an "even-odd effect" due to non-Abelian braiding.
authors.affiliation: Princeton Center for Theoretical Science, Princeton University, Princeton, New Jersey 08544, USA.|Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford, OX1 3NP, United Kingdom.
authors.forename: C W
authors.initials: CW
authors.lastname: von Keyserlingk
authors.affiliation: Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford, OX1 3NP, United Kingdom.
authors.forename: S H
authors.initials: SH
authors.lastname: Simon
authors.affiliation: Institut für Theoretische Physik, Universität Leipzig, D-04103, Leipzig, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Rosenow