Characterizing neutral modes of fractional states in the second Landau level

• Published in: Physical review letters Vol. 107; no. 3; p. 036805
• Main Authors: Dolev, M, Gross, Y, Sabo, R, Gurman, I, Heiblum, M, Umansky, V, Mahalu, D
• Format: Journal Article
• Language: English
• Published: United States 13.07.2011
• ISSN: 1079-7114
• DOI: 10.1103/physrevlett.107.036805

Fractionally charged quasiparticles, which obey non-abelian statistics, were predicted to exist in the ν=8/3, ν=5/2, and ν=7/3 fractional quantum Hall states (in the second Landau level). Here we present measurements of charge and neutral modes in these states. For both ν=7/3 and ν=8/3 states, we found a quasiparticle charge e=1/3 and an upstream neutral mode only in ν=8/3-excluding the possibility of non-abelian Read-Rezayi states and supporting Laughlin-like states. The absence of an upstream neutral mode in the ν=7/3 state also proves that edge reconstruction was not present in the ν=7/3 state, suggesting its absence also in ν=5/2 state, and thus may provide further support for the non-abelian anti-pfaffian nature of the ν=5/2 state.