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Title: Spectral functions with the density matrix renormalization group: Krylov-space approach for correction vectors

Journal Article · · Physical Review E
 [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Frequency-dependent correlations, such as the spectral function and the dynamical structure factor, help illustrate condensed matter experiments. Within the density matrix renormalization group (DMRG) framework, an accurate method for calculating spectral functions directly in frequency is the correction-vector method. The correction vector can be computed by solving a linear equation or by minimizing a functional. Our paper proposes an alternative to calculate the correction vector: to use the Krylov-space approach. Further, this paper also studies the accuracy and performance of the Krylov-space approach, when applied to the Heisenberg, the t-J, and the Hubbard models. The cases we studied indicate that the Krylov-space approach can be more accurate and efficient than the conjugate gradient, and that the error of the former integrates best when a Krylov-space decomposition is also used for ground state DMRG.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1361304
Alternate ID(s):
OSTI ID: 1333029
Journal Information:
Physical Review E, Vol. 94, Issue 5; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Magnetic field-induced intermediate quantum spin liquid with a spinon Fermi surface journal May 2019
Block excitonic condensate at n = 3.5 in a spin-orbit coupled t 2 g multiorbital Hubbard model journal April 2019
Computing Resonant Inelastic X-Ray Scattering Spectra Using The Density Matrix Renormalization Group Method journal July 2018
Fingerprints of an orbital-selective Mott phase in the block magnetic state of BaFe2Se3 ladders journal June 2019
Spin dynamics of the block orbital-selective Mott phase journal September 2018
Influence of Rashba spin-orbit coupling on the 0- π transition and Kondo temperature in one-dimensional superconductors journal December 2019
Non-local correlations in the orbital selective Mott phase of a one dimensional multi-orbital Hubbard model text January 2016
Computing Resonant Inelastic X-Ray Scattering Spectra Using The Density Matrix Renormalization Group Method text January 2018
Fingerprints of an Exotic Orbital-Selective Mott Phase in the Block Magnetic State of BaFe$_2$Se$_3$ Ladders text January 2018
Magnetic field induced intermediate quantum spin-liquid with a spinon Fermi surface text January 2018