  Graphene nanoribbons provide an ideal platform for electronic interferometry
in the Integer Quantum Hall regime. Here, we solve the time-dependent
four-component Schroedinger equation for single carriers in graphene and expose
several dynamical effects of the carrier localization on their transport
characteristics in pn junctions. We simulate two kinds of Mach-Zender
Interferometers (MZI). The first is based on Quantum Point Contacts and is
similar to traditional GaAs/AlGaAs interferometers. As expected, we observe
Aharonov-Bohm oscillations and phase averaging. The second is based on Valley
Beam Splitters, where we observe unexpected phenomena due to the intersection
of the Edge Channels that constitute the MZI. Our results provide further
insights into the behavior of graphene interferometers. Additionally, they
highlight the operative regime of such nanodevices for feasible single-particle
implementations.
