Improved energy extrapolation with infinite projected entangled-pair states applied to the two-dimensional Hubbard model

Philippe Corboz
Phys. Rev. B 93, 045116 – Published 14 January 2016

Abstract

An infinite projected entangled-pair state (iPEPS) is a variational tensor network ansatz for two-dimensional wave functions in the thermodynamic limit where the accuracy can be systematically controlled by the bond dimension D. We show that for the doped Hubbard model in the strongly correlated regime (U/t=8,n=0.875) the iPEPS yields lower variational energies than state-of-the-art variational methods in the large two-dimensional limit, which demonstrates the competitiveness of the method. In order to obtain an accurate estimate of the energy in the exact infinite-D limit we introduce and test an extrapolation technique based on a truncation error computed in the iPEPS imaginary time evolution algorithm. The extrapolated energies are compared with accurate quantum Monte Carlo results at half-filling and with various other methods in the doped, strongly correlated regime.

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  • Received 25 August 2015
  • Revised 22 December 2015

DOI:https://doi.org/10.1103/PhysRevB.93.045116

©2016 American Physical Society

Authors & Affiliations

Philippe Corboz*

  • Institute for Theoretical Physics, University of Amsterdam, Science Park 904, Postbus 94485, 1090 GL Amsterdam, The Netherlands

  • *Electronic address: p.r.corboz@uva.nl

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Vol. 93, Iss. 4 — 15 January 2016

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