Finite-temperature density matrix renormalization using an enlarged Hilbert space

[摘要] We apply a generalization of the time-dependent density matrix renormalization group (DMRG) to study finite-temperature properties of several quantum spin chains, including the frustrated J(1)-J(2) model. We discuss several practical issues with the method, including use of quantum numbers and finite-size effects. We compare with transfer-matrix DMRG, finding that both methods produce excellent results.

[发布日期] 2005-12-01

[关键词] QUANTUM-LATTICE SYSTEMS;ZIGZAG SPIN CHAIN;HEISENBERG CHAIN;THERMODYNAMICS;STATE