Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-09-19
J. Theor. Comput. Chem. 8(5), 837-848 (2009).
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1142/S0219633609005064
Based on the contractor renormalization group (CORE) method and the density matrix renormalization group (DMRG) method, a new computational scheme, which is called the block density matrix renormalization group with effective interactions (BDMRG-EI), is proposed to deal with the numerical computation of quantum correlated systems. Different from the convential CORE method in the ways of calculating the blocks and the fragments, where the DMRG method instead of the exact diagonalization is employed in BDMRG-EI, DMRG-EI makes the calculations of larger blocks and fragments applicable. Integrating DMRG's advantage of high accuracy and CORE's advantage of low computational costs, BDMRG-EI can be widely used for the theoretical calculations of the ground state and low-lying excited states of large systems with simple or complicated connectivity. Test calculations on a 240 site one-dimensional chain and a double-layer polyacene oligomer containing 48 hexagons demonstrate the efficiency and potentiality of the method.
Jiang Yuansheng
Liu Chun-gen
Ma Haibo
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