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In a four terminal sample microscopic time-reversibility leads to symmetryrelations between resistance measurements where the role of current and voltageleads are exchanged. These reciprocity relations are a manifestation of generalOnsager-Casimir symmetries in equilibrium systems. We investigateexperimentally the validity of time reversal symmetry in a$GaAs/Ga_{1-x}Al_xAs$ Hall bar irradiated by an external AC field, at zeromagnetic field. For inhomogeneous AC fields we find strong deviations fromreciprocity relations and show that their origin can be understood from the thebilliard model of a Hall junction. Under homogeneous irradiation the symmetryis more robust, indicating that time-reversal symmetry is preserved.

Hall detection of time-reversal symmetry breaking under AC electric driv ing