title: Quantum phase transitions in matrix product systems.
abstract: We investigate quantum phase transitions (QPTs) in spin chain systems characterized by local Hamiltonians with matrix product ground states. We show how to theoretically engineer such QPT points between states with predetermined properties. While some of the characteristics of these transitions are familiar, like the appearance of singularities in the thermodynamic limit, diverging correlation length, and vanishing energy gap, others differ from the standard paradigm: In particular, the ground state energy remains analytic, and the entanglement entropy of a half-chain stays finite. Examples demonstrate that these kinds of transitions can occur at the triple point of "conventional" QPTs.
authors.affiliation: Max-Planck-Institute for Quantum Optics, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.
authors.forename: Michael M
authors.initials: MM
authors.lastname: Wolf
authors.forename: Gerardo
authors.initials: G
authors.lastname: Ortiz
authors.forename: Frank
authors.initials: F
authors.lastname: Verstraete
authors.forename: J Ignacio
authors.initials: JI
authors.lastname: Cirac