Algebraic area enumeration of random walks on the honeycomb lattice

Li Gan (1) , Stéphane Ouvry (1) , Alexios P. Polychronakos

1 LPTMS - Laboratoire de Physique Théorique et Modèles Statistiques

We study the enumeration of closed walks of given length and algebraic area on the honeycomb lattice. Using an irreducible operator realization of honeycomb lattice moves, we map the problem to a Hofstadter-like Hamiltonian and show that the generating function of closed walks maps to the grand partition function of a system of particles with exclusion statistics of order $g=2$ and an appropriate spectrum, along the lines of a connection previously established by two of the authors. Reinterpreting the results in terms of the standard Hofstadter spectrum calls for a mixture of $g=1$ (fermion) and $g=2$ exclusion particles whose properties merit further studies. In this context we also obtain some unexpected Fibonacci sequences within the weights of the combinatorial factors appearing in the counting of walks.

Mots clés: random walk; lattice; partition function; spectral representation; algebra; statistics

Domaines: Physique mathématique [math-ph]; Physique des Hautes Energies - Théorie [hep-th]; Physique Générale [physics.gen-ph]

Li Gan, Stéphane Ouvry, Alexios P. Polychronakos. Algebraic area enumeration of random walks on the honeycomb lattice. Physical Review E , 2022, 105 (1), pp.014112. ⟨10.1103/PhysRevE.105.014112⟩. ⟨hal-03318233⟩