  The kinetic effects of magnetic fields on the transport of relativistic jet
in the intergalactic medium remain uncertain, especially for their
perpendicular component. By particle-in-cell simulations, we find that when
only jet electrons are fully magnetized, they are directly deflected by the
magnetic field, but jet protons are mainly dragged by collective
charge-separation electric field. However, when both electrons and protons are
fully magnetized, the contrary is the case. Their balance tremendously distorts
the jet density and electromagnetic fields, leading to enormous energy exchange
between different species and fields. As a result, the electron spectrum energy
distribution (SED) gets reshaped and the power law slope of the SED decreases
as the magnetic field strength increases. In other words, we may infer that
magnetic fields around the relativistic jet play a crucial role in shaping the
observed SED.
