Out of equilibrium correlation functions of quantum anisotropic XY models: one-particle excitations

Details Out of equilibrium correlation functions of quantum anisotropic XY models: one-particle excitations Out of equilibrium correlation functions of quantum anisotropic XY models: one-particle excitations

2003-06-11

arxiv.org/abs/cond-mat/0306285v2

J.Phys.A37:291-302,2004

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, no figures; revtex. Minor changes in the text; list of refs. modified

Scientific paper

10.1088/0305-4470/37/2/001

We calculate exactly matrix elements between states that are not eigenstates of the quantum XY model for general anisotropy. Such quantities therefore describe non equilibrium properties of the system; the Hamiltonian does not contain any time dependence. These matrix elements are expressed as a sum of Pfaffians. For single particle excitations on the ground state the Pfaffians in the sum simplify to determinants.

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