Path-integral renormalization group method for numerical study on ground states of strongly correlated electronic systems

Tsuyoshi Kashima, Masatoshi Imada

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

A new efficient numerical algorithm for interacting fermion systems is proposed and examined in detail. The ground state is expressed approximately by a linear combination of numerically chosen basis states in a truncated Hilbert space. Two procedures lead to a better approximation. The first is a numerical renormalization, which optimizes the chosen basis and projects onto the ground state within the fixed dimension, L, of the Hilbert space. The second is an increase of the dimension of the truncated Hilbert space, which enables the linear combination to converge to a better approximation. The extrapolation L → ∞ after the convergence removes the approximation error systematically. This algorithm does not suffer from the negative sign problem and can be applied to systems in any spatial dimension and arbitrary lattice structure. The efficiency is tested and the implementation explained for two-dimensional Hubbard models where Slater determinants are employed as chosen basis. Our results with less than 400 chosen basis indicate good accuracy within the errorbar of the best available results as those of the quantum Monte Carlo for energy and other physical quantities.

Original languageEnglish
Pages (from-to)2287-2299
Number of pages13
Journaljournal of the physical society of japan
Volume70
Issue number8
DOIs
Publication statusPublished - 2001 Aug 1
Externally publishedYes

Keywords

  • Hubbard model
  • Numerical renormalization group
  • Quantum simulation
  • Strongly correlated electron systems

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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