Exact Solution of the Discrete (1+1)-dimensional RSOS Model with Field and Surface Interactions

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We present the solution of a linear Restricted Solid--on--Solid (RSOS) model in a field. Aside from the origins of this model in the context of describing the phase boundary in a magnet, interest also comes from more recent work on the steady state of non-equilibrium models of molecular motors. While similar to a previously solved (non-restricted) SOS model in its physical behaviour, mathematically the solution is more complex. Involving basic hypergeometric functions ₃ϕ₂, it introduces a new form of solution to the lexicon of directed lattice path generating functions.