The charge of quasiparticles in a fractional quantum Hall (FQH) liquid, tunneling through a partly reflecting constriction with transmission t, was determined via shot noise measurements. In the nu=1/3 FQH state, a charge smoothly evolving from e*=e/3 for t=1 to e*=e for t<<1 was determined, agreeing with chiral Luttinger liquid theory. In the nu=2/5 FQH state the quasiparticle charge evolves smoothly from e*=e/5 at t=1 to a maximum charge less than e*=e/3 at t<<1. Thus it appears that quasiparticles with an approximate charge e/5 pass a barrier they see as almost opaque.
@article{arxiv.cond-mat/0007264,
title = {The Evolution of Quasiparticle Charge in the Fractional Quantum Hall Regime},
author = {T. G. Griffiths and E. Comforti and M. Heiblum and Ady Stern and V. Umansky},
journal= {arXiv preprint arXiv:cond-mat/0007264},
year = {2009}
}