Ramasesha, S. ; Pati, Swapan K. ; Krishnamurthy, H. R. ; Shuai, Z. ; Bredas, J. L. (1996) Symmetrized density-matrix renormalization-group method for excited states of hubbard models Physical Review B, 54 (11). pp. 7598-7601. ISSN 0163-1829
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Official URL: http://prb.aps.org/abstract/PRB/v54/i11/p7598_1
Related URL: http://dx.doi.org/10.1103/PhysRevB.54.7598
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 17528 |
| Deposited On: | 16 Nov 2010 09:38 |
| Last Modified: | 04 Jun 2011 11:25 |
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