  We consider electronic transport through laterally parallel double open
quantum dots embedded in a quantum wire in a perpendicular magnetic field. The
coupling modes of the dots are tunable by adjusting the strength of a central
barrier and the applied magnetic field. Probability density and electron
current density are calculated to demonstrate transport effects including
magnetic blocking, magnetic turbulence, and a hole-like quasibound state
feature. Fano to dip line-shape crossover in the conductance is found by
varying the magnetic field.
