Evolution of quasiparticle charge in the fractional quantum hall regime

The charge of quasiparticles in a fractional quantum Nail (FQH) liquid, tun neling through a partly reflecting constriction with transmission t, was de termined via shot noise measurements. In the nu = 1/3 FQH state, a charge s moothly evolving from e* = e/3 for t(1/3) congruent to 1 to e* = e for t(1/ 3) << 1 was determined, agreeing with chiral Luttinger liquid theory. In th e nu = 2/5 FQH state the quasiparticle charge evolves smoothly from e* = e/ 5 at t(2/5) congruent to 1 to a maximum charge less than e* = e/3 at t(2/5) << 1 Thus it appears that quasiparticles with an approximate charge e/5 pa ss a barrier they see as almost opaque.