Symmetrized density-matrix renormalization-group method for excited states of Hubbard models

S. Ramasesha*, Swapan K. Pati, H. R. Krishnamurthy, Z. Shuai, J. L. Brédas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

We extend the density-matrix renormalization-group (DMRG) method to exploit parity, C2 (rotation by π), and electron-hole symmetries of model Hamiltonians. We demonstrate the power of this method by obtaining the lowest-energy states in all eight symmetry subspaces of Hubbard chains with up to 50 sites. The ground-state energy, optical gap, and spin gap of regular U = 4t and U= 6t Hubbard chains agree very well with exact results. This development extends the scope of the DMRG method and allows future applications to study of optical properties of low-dimensional conjugated polymeric systems.

Original languageEnglish (US)
Pages (from-to)7598-7601
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume54
Issue number11
StatePublished - Sep 15 1996
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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