I wonder if I could plot the Fig1.(a) in Physical Review A 87, 063421 (2013), a triangular lattice in MMA. I undetstand that those atoms and interactions can be added by Adobe AI after obtaining the eps by MMA.
Actually I've tried by defining a piecewise function and Plot3D, but it seems to be wierd and the figure is uncontinuous at the boundaries.
Thanks a lot.