Antichiral edge states and Bogoliubov Fermi surfaces in a two-dimensional proximity-induced superconductor

We show that a magnetic field parallel to the plane of a two-dimensional electron gas with Rashba spin-orbit coupling in proximity to a superconductor leads to a topological phase in coexistence with a single pair of Bogoliubov Fermi surfaces. This phase hosts antichiral edge states of copropagating Majorana fermions and are spatially localized at the opposite edges of the sample, perpendicular to the magnetic field. We discuss the characteristic signatures in the current-phase relation of a Josephson junction formed by two reservoirs in the topological phase.