Transfer Matrix DMRG for Thermodynamics of One-Dimensional Quantum Systems
Abstract
The transfer matrix DMRG method for one dimensional quantum lattice systems has been developed by considering the symmetry property of the transfer matrix and introducing the asymmetric reduced density matrix. We have evaluated a number of thermodynamic quantities of the anisotropic spin-1/2 Heisenberg model using this method and found that the results agree very accurately with the exact ones. The relative errors for the spin susceptibility are less than
10
−3
down to
T=0.01J
with 80 states kept.