A controllable double-well optical trap for cold atoms (or molecules) using a binary π-phase plate: experimental demonstration and Monte Carlo simulationR. W. Mu, Z. L. Wang, Y. L. Li, X. M. Ji and J. P. YinEur. Phys. J. D, 59 2 (2010) 291-300DOI: https://doi.org/10.1140/epjd/e2010-00148-x