Abstract
We report a transport experiment in the quantum Hall regime on the transmission of electron waves from a region exhibiting the ν=1 integral quantum Hall effect, through a barrier region exhibiting the ν= 2 3 fractional quantum Hall effect. Our work represents the first transport study across an interface between an integral and a fractional quantum Hall effect. We analyze our data in terms of the Büttiker-Landauer formalism and conduction via Landau edge states. We find a transmission probability of 2 3 (0.999 ± 0.002) and a reflection probability of 1 3 (0.995 ± 0.003). These results can be interpreted in two ways: (1) they yield a quasi-particle charge of ( −e 3 ) ± 0.5% in the 2 3 effect, and (2) the single-particle electronic density of states is reduced to 2 3 the value for a non-interacting electron system.
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