Product Wave Function Renormalization Group Method

TL;DR

The paper introduces the PWFRG, a fast numerical renormalization group technique for 1D quantum and 2D classical lattice models, utilizing a variational matrix product wave function improved via self-consistency.

Contribution

It presents the PWFRG method, a novel approach that accelerates renormalization group calculations while maintaining the fixed point of the DMRG method.

Findings

PWFRG achieves faster convergence than traditional methods.

The method is applicable to both quantum and classical lattice models.

It preserves the fixed point structure of DMRG.

Abstract

The authors propose a fast numerical renormalization group method --- the product wave function renormalization group (PWFRG) method --- for 1D quantum lattice models and 2D classical ones. A variational wave function, which is expressed by a matrix product, is improved through a self-consistent calculation. The new method has the same fixed point as the density matrix renormalization group method.