Session H30: Electronic Properties of Graphene and Related Structures II
8:00 AM–11:00 AM, Tuesday, March 11, 2008
Morial Convention Center Room: 222
Sponsoring Unit:
DCMP
Chair: Giovanni Cantele, Istituto Nazionale per la Fisica della Materia
Abstract ID: BAPS.2008.MAR.H30.8
Abstract: H30.00008 : Fractional statistics of topological defects in graphene and related structures
9:24 AM–9:36 AM
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Abstract 
Authors:
Babak Seradjeh
(University of British Columbia)
Marcel Franz
(University of British Columbia)
We show that fractional charges bound to topological defects in the recently proposed time-reversal-invariant models of spinless fermions on the honeycomb lattice with Kekule distortion and on the $\pi$-flux square lattice with Peierls distortion obey fractional statistics. The continuum effective low-energy description is given in terms of a `doubled' level-2 Chern-Simons field theory, which is parity and time-reversal invariant and implies two species of semions (particles with statistical angle $\pm\pi/2$) labeled by a new emergent quantum number that we identify as the fermion axial charge.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.H30.8