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The non-compact XXZ spin chain as stochastic particle process

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arxiv 1904.02191 v3 pith:5AMCZWOF submitted 2019-04-03 math-ph cond-mat.stat-mechhep-thmath.MPmath.PR

The non-compact XXZ spin chain as stochastic particle process

classification math-ph cond-mat.stat-mechhep-thmath.MPmath.PR
keywords processchainspinasymmetricnon-compactstochasticmodelparticle
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In this note we relate the Hamiltonian of the integrable non-compact spin $s$ XXZ chain to the Markov generator of a stochastic particle process. The hopping rates of the continuous-time process are identified with the ones of a q-Hahn asymmetric zero range model. The main difference with the asymmetric simple exclusion process (ASEP), which can be mapped to the ordinary XXZ spin chain, is that multiple particles can occupy one and the same site. For the non-compact spin $\frac{1}{2}$ XXZ chain the associated stochastic process reduces to the multiparticle asymmetric diffusion model introduced by Sasamoto-Wadati.

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