Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-12-24
Physical Review Letters 91, 049701 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
1 page, 2 figures
Scientific paper
10.1103/PhysRevLett.91.049701
In a recent Letter [Phys. Rev. Lett. 88, 256403(2002), cond-mat/0109158] Cazalilla and Marston proposed a time-dependent density- matrix renormalization group (TdDMRG) algorithm for the accurate evaluation of out-of-equilibrium properties of quantum many-body systems. For a point contact junction between two Luttinger liquids, a current oscillation develops after initial transient in the insulating regime. Here we would like to point out that (a) the observed oscillation is an artifact of the method; (b) the TdDMRG can be significantly improved by incorporating the non-equilibrium evolution of the goundstate into the density matrix.
Luo Hong-Gang
Wang Xiao Qian
Xiang Tao
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