Unified phase diagram of models exhibiting a neutral-ionic transition

被引:21
|
作者
Legeza, Ö [1 ]
Buchta, K [1 ]
Sólyom, J [1 ]
机构
[1] Res Inst Solid State Phys & Opt, H-1525 Budapest, Hungary
关键词
D O I
10.1103/PhysRevB.73.165124
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have studied the neutral-ionic transition in organic mixed-stack compounds. A unified model has been derived which, in limiting cases, is equivalent to the models proposed earlier, the donor-acceptor model, and the ionic Hubbard model. Detailed numerical calculations have been performed on this unified model with the help of the density-matrix renormalization-group (DMRG) procedure calculating excitation gaps, ionicity, lattice site entropy, two-site entropy, and the dimer order parameter on long chains and the unified phase diagram has been determined.
引用
收藏
页数:11
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