The spin-Peierls chain revisited

[摘要] We extend previous analytical studies of the ground-state phase diagram of a one-dimensional Heisenberg spin chain coupled to optical phonons, which for increasing spin-lattice coupling undergoes a quantum phase transition from a gapless to a gaped phase with finite lattice dimerisation. We check the analytical results against established four-block and new two-block density matrix renormalisation group (DMRG) calculations. Different finite-size scaling behaviour of the spin excitation gaps is found in the adiabatic and anti-adiabatic regimes. (c) 2006 Elsevier B.V. All rights reserved.

[发布日期] 2007-03-01

[效力级别]  Proceedings Paper

[关键词] magnetoelastic coupling;spin-peierls transition;DMRG