出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We use the Quantum Monte Carlo Stochastic Series Expansion (SSE) algorithm to investigate the
properties of the one-dimensional Heisenberg ferromagnet. We consider the model for two spin
values s = 1
2 and s = 1 and study the dependence of the specific heat, magnetisation, magnetic
susceptibility and correlation functions on temperature and magnetic field. Obtained results are
compared to those derived by analytical methods (Bethe ansatz, Green’s function, Random Phase
Approximation). In particular, the surprising prediction of a double-peak structure in the specific
heat at low temperatures and small magnetic fields can be confirmed.
