Exactly Solvable Lattice Models with Crossing Symmetry

Abstract

We show how to compute the exact partition function for lattice statistical-mechanical models whose Boltzmann weights obey a special "crossing" symmetry. The crossing symmetry equates partition functions on different trivalent graphs, allowing a transformation to a graph where the partition function is easily computed. The simplest example is counting the number of nets without ends on the honeycomb lattice, including a weight per branching. Other examples include an Ising model on the Kagome' lattice with three-spin interactions, dimers on any graph of corner-sharing triangles, and non-crossing loops on the honeycomb lattice, where multiple loops on each edge are allowed. We give several methods for obtaining models with this crossing symmetry, one utilizing discrete groups and another anyon fusion rules. We also present results indicating that for models which deviate slightly from having crossing symmetry, a real-space decimation (renormalization-group-like) procedure restores the crossing symmetry.

References in corpus (4)

• Tensor renormalization group approach to 2D classical lattice models
• Space-Time Geometry of Topological phases
• Finite size behaviors of critical Ising model on a rectangle with free boundaries
• Bond-Propagation Algorithm for Thermodynamic Functions in General 2D Ising Models

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• Tensor-network approach to phase transitions in string-net models
• Transforming Generalized Ising Model into Boltzmann Machine
• Renyi entropies for classical stringnet models
• Functional completeness of planar Rydberg blockade structures
• Emergent Exclusion Statistics of Fibonacci Anyons in 2D Topological Phases
• Wegner-Wilson loops in string nets
• Topological and nontopological degeneracies in generalized string-net models