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. {} 1996 The American Physical Society.
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Ramasesha et al. (1996) studied this question.
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