  Chiral Majorana edge modes are theoretically proposed to perform braiding
operations for the potential quantum computation. Here, we suggest a scheme to
regulate trajectories of the chiral Majorana fermion based on a quantum
anomalous Hall insulator (QAHI)-topological superconductor heterostructure. An
applied external gate voltage to the QAHI region introduces a dynamical phase
so that the outgoing Majorana fermions can be prominently tuned to different
leads. The trajectory is mechanically analyzed and the electrical manipulation
is represented by the oscillating transmission coefficients versus the gate
voltage. Through the optimization of devices, the conductance is likewise
detectable to be periodically oscillating, which means an experimental control
of chiral Majorana edge modes. Besides, this oscillating period which is robust
against disorder also provides an attainable method of observing the energy
dispersion relation of the edge mode of the QAHI. Furthermore, the oscillating
behavior of conductance serves as smoking-gun evidence of the existence of the
chiral Majorana fermion, which could be experimentally confirmed.
