Efficient perturbation theory to improve the density matrix renormalization group
Efficient perturbation theory to improve the density matrix renormalization group
The density matrix renormalization group (DMRG) is one of the most powerful numerical methods available for many-body systems. It has been applied to solve many physical problems, including the calculation of ground states and dynamical properties. In this work, we develop a perturbation theory of the DMRG (PT-DMRG) to greatly …