Bose-Einstein condensation on inhomogeneous networks: Mesoscopic aspects versus thermodynamic limit
Anno: 2002
Autori: Buonsante P., Burioni R., Cassi D., Vezzani A.
Affiliazione autori: Dipartimento di Fisica and INFM, Università degli Studi di Parma; Dipartimento di Fisica, Politecnico di Torino
Abstract: We study the filling of states in a pure hopping boson model on the comb lattice, a low-dimensional discrete structure where geometrical inhomogeneity induces Bose-Einstein condensation (BEC) at finite temperature. By a careful analysis of the thermodynamic limit on combs we show that, unlike the standard lattice case, BEC is characterized by a macroscopic occupation of a finite number of states with energy belonging to a small neighborhood of the ground state energy. Such a remarkable feature gives rise to an anomalous behavior in the large distance two-point correlation functions. Finally, we prove a general theorem providing the conditions for the pure hopping model to exhibit the standard behavior, i.e. to present a macroscopic occupation of the ground state only.
Giornale/Rivista: PHYSICAL REVIEW B
Volume: 66 (9) Da Pagina: 094207 A: 094207
Parole chiavi: lattice models; Bose-Einstein condensations; topological inhomogeneityDOI: 10.1103/PhysRevB.66.094207Citazioni: 29dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-05-18Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
