Particle-hole symmetry in the quantum Hall transport

Particle-hole symmetry is a central concept in the quantum Hall effects and is invoked to explain the observation of incompressible quantum Hall states for symmetric filling factors v reversible arrow 1 - v. We report finite-bias measurements of the current transmission through a split-gate constriction in the quantum Hall regime displaying signatures linked to the presence of this symmetry. Experimental data are also discussed in light of the Luttinger model for edge channels. We show how particle-hole duality can be exploited to design QH circuits where transport can be more easily interpreted in terms of "holes" in a filled Landau level.