  Quantum-mechanical calculations of electron magnetotransport in graphene
Fabry-P\'{e}rot interferometers are presented with a focus on the role of
spatial structure of edge channels. For an interferometer that is made by
removing carbon atoms, which is typically realized in nanolithography
experiments, the constrictions are shown to cause strong inter-channel
scattering that establishes local equilibrium and makes the electron transport
non-adiabatic. Nevertheless, two-terminal conductance reveals a common
Aharonov-Bohm oscillation pattern, independent of crystallographic orientation,
which is accompanied by single-particle states that sweep through the Fermi
energy for the edge channels circulating along the physical boundary of the
device. The interferometer constrictions host the localized states that might
shorten the device or disrupt the oscillation pattern. For an interferometer
that is created by electrostatic confinement, which is typically done in the
split-gate experiments, electron transport is shown to be adiabatic if the
staggered potential is introduced additionally into the model. Interference
visibility decays exponentially with temperature with a weaker dependence at
low temperature.
