Correlation density matrix : an unbiased analysis of exact diagonalizations
Cheong, Siew Ann
Henley, Christopher L.
Date of Issue2009
School of Physical and Mathematical Sciences
Given the ground-state wave function for an interacting lattice model, we define a “correlation density matrix” (CDM) for two disjoint separated clusters A and B to be the density matrix of their union minus the direct product of their respective density matrices. The CDM can be decomposed systematically by a numerical singular-value decomposition to provide a systematic and unbiased way to identify the operator(s) dominating the correlations, even unexpected ones.
DRNTU::Science::Physics::Atomic physics::Solid state physics
Physical review B
Physical Review B © copyright 2009 The American Physical Society. The journal's website is located at http://link.aps.org/doi/10.1103/PhysRevB.79.212402.