Tunneling Dynamics of Two-Species Molecular Bose-Einstein Condensates

We study tunneling dynamics of atomic group in two-species molecular Bose-Einstein condensates.It isshown that the tunneling of the atom group depends on not only the tunneling coupling constant between the atomicpair molecular condensate and the three-atomic group molecular condensate,but also the inter-molecular nonlinearinteractions and the initial number of atoms in these condensates.It is discovered that besides oscillating tunnelingcurrent between the atomic pair molecular condensate and the three-atomic group molecular condensate,the nonlinearatomic group tunneling dynamics sustains a self-maintained population imbalance:a macroscopic quantum self-trappingeffect.