Quantum coherence and decoherence of correlated electron states in the one-dimensional charge-density-wave-spin-density-wave phase transition
Quantum coherence and decoherence of correlated electron states in the one-dimensional charge-density-wave-spin-density-wave phase transition
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一维电荷-密度-波-自旋-密度-波相变中相关电子态的量子相干和退相干
DOI：
10.1103/physrevb.73.115105
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发表时间：
2006
影响因子：
3.7
通讯作者：
N. Tomita
中科院分区：
文献类型：
--
作者：
N. Tomita
从关联态的量子相干性或退相干性出发，研究了强关联区一维扩展Hubbard模型的电荷密度波（CDW）-自旋密度波（SDW）相变.在有限尺寸系统中，由于SDW畴的存在，CDW波函数在相界附近具有显著的量子涨落。这些SDW域的叠加导致CDW和SDW波函数之间的量子相干性。然而，标度分析表明，在无限尺寸极限下，SDW涨落的密度渐近为零，这表明在体相变中两个状态的退相干。
The charge-density-wave (CDW)–spin-density-wave (SDW) phase transition of the one-dimensional extended Hubbard model is investigated in the strong correlation regime, from the viewpoint of the quantum coherence or decoherence of the two correlated states. In the finite-size system, the CDW wave function, near the phase boundary, has the significant quantum fluctuations due to the SDW domains. The superposition of these SDW domains leads to the quantum coherence between the CDW and SDW wave functions. However, the scaling analysis shows that the density of the SDW fluctuations becomes asymptotically zero in the infinite-size limit, which indicates the decoherence of the two states in the bulk phase transition.