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We use an electronic Mach-Zehnder interferometer to explore thenon-equilibrium coherence of the electron waves within the edge-states thatform in the integral quantum Hall effect. The visibility of the interference asa function of bias-voltage and transmission probabilities of the mirrors, whichare realized by quantum point-contacts, reveal an unexpected asymmetry atfinite bias when the transmission probability $T$ of the mirror at the input ofthe interferometer is varied between 0 and 100%, while the transmissionprobability of the other mirror at the output is kept fixed. This can lead tothe surprising result of an increasing magnitude of interference withincreasing bias-voltage for certain values of $T$. A detailed analysis forvarious transmission probabilities and different directions of the magneticfield demonstrates that this effect is not related to the transmissioncharacteristics of a single quantum point contact, but is an inherent propertyof the Mach-Zehnder interferometer with edge-states.

Unexpected finite-bias visibility dependence in an electronic Mach Zehnder interferometer