Convex-set description of quantum phase transitions in the transverse Ising model using reduced-density-matrix theory.

Abstract

Quantum phase transitions in N-particle systems can be identified and characterized by the movement of the two-particle reduced density matrix (2-RDM) along the boundary of its N-representable convex set as a function of the Hamiltonian parameter controlling the phase transition [G. Gidofalvi and D. A. Mazziotti, Phys. Rev. A 74, 012501 (2006)]. For the one… (More)
DOI: 10.1063/1.3143403

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