Quasiparticle Tunneling in the Fractional Quantum Hall State at \nu = 5/2
Abstract
Theory predicts that quasiparticle tunneling between the counter-propagating edges in a fractional quantum Hall state can be used to measure the effective quasiparticle charge e* and dimensionless interaction parameter g, and thereby characterize the many-body wavefunction describing the state. We report measurements of quasiparticle tunneling in a high mobility GaAs two dimensional electron system in the fractional quantum Hall state at nu=5/2 using a gate-defined constriction to bring the edges close together. We find the dc-bias peaks in the tunneling conductance at different temperatures collapse onto a single curve when scaled, in agreement with weak tunneling theory. Various models for the \nu=5/2 state predict different values for g. Among these models, the non-abelian states with e*=1/4 and g=1/2 are most consistent with the data.
Keywords
Cite
@article{arxiv.0803.3530,
title = {Quasiparticle Tunneling in the Fractional Quantum Hall State at \nu = 5/2},
author = {Iuliana P. Radu and J. B. Miller and C. M. Marcus and M. A. Kastner and L. N. Pfeiffer and K. W. West},
journal= {arXiv preprint arXiv:0803.3530},
year = {2008}
}
Comments
supporting material: http://marcuslab.harvard.edu/Radu_SOMs.pdf