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.
Restricted to Registered users only
Download (86Kb) | Request a copy
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|
|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|
Actions (login required)