We note that a tridiagonal matrix representation of the algebra of the partially asymmetric exclusion process (PASEP) lends itself to interpretation as the transfer matrix for weighted Motzkin lattice paths. A continued-fraction ('J fraction') representation of the lattice-path-generating function is particularly well suited to discussing the PASEP, for which the paths have height-dependent weights. We show that this not only allows a succinct derivation of the normalization and correlation lengths of the PASEP, but also reveals how finite-dimensional representations of the PASEP algebra, valid only along special lines in the phase diagram, relate to the general solution that requires an infinite-dimensional representation.
|Journal||Journal of Physics A: Mathematical and Theoretical|
|Publication status||Published - 2009|
Bibliographical noteThe full text is available free from the link given. The published version can be found at http://dx.doi.org/10.1088/1751-8113/42/32/325002.
- phase transitions: general studies
- matrix theory
- nonequilibrium and irreversible thermodynamics
- graph theory
- lattice theory and statistics (Ising