Dynamics of copropagating edge states in a multichannel Mach-Zender interferometer

We study numerically a multichannel electronic Mach-Zender interferometer, where an orthogonal magnetic field produces edge states. Our time-dependent model is based on the split-step Fourier method and describes the charge carrier as a Gaussian wavepacket of edge states, whose path is defined by split-gate induced potential profiles on the 2DEG at filling factor ? = 2. We analyse a beam splitter with ~ 50% inter-channel mixing and obtain Aharonov-Bohm oscillations in the transmission probability of the second channel.