A magnetic field applied parallel to a two-dimensional electron gas with Rashba spin–orbit coupling can induce the formation of Bogoliubov Fermi surfaces. Under suitable conditions, these states are associated with a topological phase hosting antichiral edge modes, consisting of co-propagating Majorana fermions localized at opposite edges of the sample, perpendicular to the magnetic field. Such a platform can be realized in hybrid semiconductor–superconductor heterostructures, where an s-wave superconductor is proximitized to a semiconductor with strong spin–orbit coupling and a large gyromagnetic factor. In this talk, I will present the key properties of this topological phase and discuss the role of orbital effects arising from magnetic field penetration at the semiconductor–superconductor interface.