Abstract
Matteo Carrega (INFN, Pisa, Italy)
Anomalous charge tunneling in the fractional quantum Hall edge states at filling factor ν = 5/2
We explain effective charge anomalies recently observed for fractional
quantum Hall edge states at nu=5/2 [1, 2]. The experimental data of
differential conductance and excess noise are fitted, using the
anti-Pfaffian model, by properly take into account renormalizations of the
Luttinger parameters induced by the coupling of the system with an
intrinsic 1/f noise. We demonstrate that a peculiar agglomerate excitation
with charge e/2, double of the expected e/4 charge, dominates the
transport properties at low temperatures and bias.
[1] M. Dolev, Y. Gross, Y. C. Chung, M. Heiblum, V. Umansky, and D.
Mahalu, Phys. Rev. B. 81, 161303(R) (2010)
[2] M. Carrega, D. Ferraro, A. Braggio, N. Magnoli, M. Sassetti, arXiv:
1102.5666 [cond-mat] (Submitted to Phys. Rev. Lett).