We have studied a clean finite-length line junction between interacting counterpropagating
single-branch fractional quantum Hall edge channels. Exact solutions for low-lying
excitations and transport properties are obtained when the two edges belong to quantum
Hall systems with different filling factors and interact via the long-range Coulomb interaction.
Charging effects due to the coupling to external edge-channel leads are fully taken into
account. Conductances and power laws in the current-voltage characteristics of tunneling …

We have studied a clean finite-length line junction between interacting counterpropagating
single-branch fractional-quantum-Hall edge channels. Exact solutions for low-lying
excitations and transport properties are obtained when the two edges belong to quantum
Hall systems with different filling factors and interact via the long-range Coulomb interaction.
Such a situation could be realized, eg, in samples with two mutually perpendicular 2D
electron systems [1] and a magnetic field properly adjusted in magnitude and direction …