Quantum wetting transitions in two dimensions: An alternative path to nonuniversal interfacial singularities
Abstract
We consider twodimensional (d=2) systems with shortranged microscopic interactions, where interface unbinding (wetting) transitions occur in the limit of vanishing temperature T. For T = 0 the transition is characterized by nonuniversal critical properties analogous to those established for thermal wetting transitions in d = 3, albeit with a redefined capillary parameter \tildeω . Within a functional renormalizationgroup treatment of an effective interfacial model, we compute the finitetemperature phase diagram, exhibiting a line of interface unbinding transitions, terminating at T = 0 with an interfacial quantumcritical point. We identify distinct scaling regimes, reflecting the interplay between quantum and thermal interfacial fluctuations. A crossover line marking the onset of the quantumcritical regime is described by the d = 3 interfacial correlationlength exponent ν_{} . This potentially opens another way to investigate the nonuniversal character of ν_{} . On the other hand, the emergent interfacial quantumcritical regime shows no signatures of nonuniversality.
 Publication:

EPL (Europhysics Letters)
 Pub Date:
 April 2015
 DOI:
 10.1209/02955075/110/16002
 arXiv:
 arXiv:1501.05664
 Bibcode:
 2015EL....11016002J
 Keywords:

 Condensed Matter  Statistical Mechanics
 EPrint:
 EPL, 110 (2015) 16002