Low-temperature density matrix renormalization group using regulated polynomial expansion

Details Low-temperature density matrix renormalization group using regulated polynomial expansion Low-temperature density matrix renormalization group using regulated polynomial expansion

2008-06-20

arxiv.org/abs/0806.3352v2

Phys. Rev. B 78, 113101 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures. Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.113101

We propose a density matrix renormalization group (DMRG) technique at finite temperatures. As is the case of the ground state DMRG, we use a single-target state that is calculated by making use of a regulated polynomial expansion. Both static and dynamical quantities are obtained after a random-sampling and averaging procedure. We apply this technique to the one-dimensional Hubbard model at half filling and find that this gives excellent results at low temperatures.

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