量子Blume-Emery-Griffiths模型中中性量子顺电相和离子铁电相相变附近的增强相干动力学
Enhanced coherent dynamics near a transition between neutral quantum-paraelectric and ionic ferroelectric phases in the quantum Blume-Emery-Griffiths model
摘要：
研究了一维量子Blume-Emery-Griffiths模型中量子相变点附近的非平衡动力学。它的赝自旋分量$ S^z $表示电极化的强度，而$ (S^z)^2 $对应于混合堆叠电荷转移复合物中的离子性，该复合物表现出中性量子顺电和离子铁电（或反铁电）相之间的转变。求解含时薛定谔方程，得到了量子顺电相的精确多体波函数。当在空间和时间上局部地对极化引入冲击力后，极化和离子性相干振荡。在量子相变点附近，振荡幅度较大。碰撞所提供的能量线性地流入这些振荡，因此非平衡行为是不合作的。
英文摘要：
Nonequilibrium dynamics are studied near the quantum phase transition point in the one-dimensional quantum Blume-Emery-Griffiths model. Its pseudo-spin component $ S^z $ represents an electric polarization, and $ (S^z)^2 $ corresponds to ionicity, in mixed-stack charge-transfer complexes that exhibit a transition between neutral quantum-paraelectric and ionic ferroelectric (or antiferroelectric) phases. The time-dependent Schrödinger equation is solved for the exact many-body wave function in the quantum paraelectric phase. After impact force is introduced on a polarization locally in space and time, polarizations and ionicity coherently oscillate. The oscillation amplitudes are large near the quantum phase transition point. The energy supplied by the impact flows linearly into these oscillations, so that the nonequilibrium behavior is uncooperative.
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