Eur. Phys. J. Special Topics 160, 127-138 (2008)
https://doi.org/10.1140/epjst/e2008-00716-9

XX model on the circle

¹ Dipartimento di Fisica, Università di Bari, 70126 Bari, Italy
² Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy
³ Dipartimento di Matematica, Università di Bari, 70125 Bari, Italy
⁴ Waseda Institute for Advanced Study, Waseda University, Tokyo, 169-8050, Japan
⁵ Department of Physics, Waseda University, Tokyo, 169-8555, Japan

Abstract

We diagonalize the XX model with a finite number of spins and periodic boundary conditions. We solve for the ground state, focus on the rapidity of the convergence to the thermodynamic limit and study the features of multipartite entanglement.