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

Ramasesha, S and Pati, Swapan K and Krishnamurthy, HR and Shuai, Z and Bredas, JL (1996) Symmetrized density-matrix renormalization-group method for excited states of Hubbard models. In: Physical Review B, 54 (11). pp. 7598-7601.

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Abstract

We extend the density-matrix renormalization-group DMRG method to exploit parity, $C_2$ (rotation by \pi), 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.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	American Physical Society
Additional Information:	Copyright of this article belongs to American Physical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Physical & Mathematical Sciences > Physics
Date Deposited:	15 Dec 2006
Last Modified:	19 Sep 2010 04:33
URI:	http://eprints.iisc.ac.in/id/eprint/9130

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