  Similarly and highly charged plates in the presence of multivalent counter
ions attract each other, leading to electrostatically bound states. Using
Monte-Carlo simulations we obtain the inter-plate pressure in the global
parameter space. The equilibrium plate separation, where the pressure changes
from attractive to repulsive, exhibits a novel unbinding transition. A
systematic and asymptotically exact strong-coupling field-theory yields the
bound state from a competition between counter-ion entropy and electrostatic
attraction, in agreement with simple scaling arguments.
