  We investigate the cyclotron dynamics of Bose-Einstein condensate (BEC) in a
quadruple-well potential with synthetic gauge fields. We use laser-assisted
tunneling to generate large tunable effective magnetic fields for BEC. The mean
position of BEC follows an orbit that simulated the cyclotron orbits of charged
particles in a magnetic field. In the absence of atomic interaction, atom
dynamics may exhibit periodic or quasi-periodic cyclotron orbits. In the
presence of atomic interaction, the system may exhibit self-trapping, which
depends on synthetic gauge fields and atomic interaction strength. In
particular, the competition between synthetic gauge fields and atomic
interaction leads to the generation of several discontinuous parameter windows
for the transition to self-trapping, which is obviously different from that
without synthetic gauge fields.
