Peierls态与电荷有序态竞争引发的可能的亚稳态
Possible Metastable State Triggered by Competition of Peierls State and Charge Ordered State
摘要：
在一维四分之一填充哈伯德模型中，考虑了Peierls基态及其竞争的亚稳态，模型中存在最近邻排斥相互作用V和电子-声子相互作用（\propto 1/K，K为弹性常数）.由平均场方法，我们得到了参数V和K平面上的基态相图。在大的V和K下，实现了自旋密度波和电荷有序的共存状态。随着K的降低，它表现出向非常规Peierls态的一级相变，该态由键心电荷密度波态描述。在Peierls基态相图的大范围内，存在能量相对于晶格畸变取局部极小值的亚稳态。在此基础上，我们讨论了（EDO-TTF）_{2} PF_{6}化合物中的光诱导相。
英文摘要：
We examine a Peierls ground state and its competing metastable state in the one-dimensional quarter-filled Peierls-Hubbard model with the nearest-neighbor repulsive interaction V and the electron-phonon interaction (\propto 1/K with K being the elastic constant). From the mean-field approach, we obtain the phase diagram for the ground state on the plane of parameters V and K. The coexistent state of the spin-density wave and the charge ordering is realized for large V and K. With decreasing K, it exhibits a first-order phase transition to the unconventional Peierls state which is described by the bond-centered charge-density-wave state. In the large region of the Peierls ground state in the phase diagram, there exists the metastable state where the energy takes a local minimum with respect to the lattice distortion. On the basis of the present calculation, we discuss the photoinduced phase observed in the (EDO-TTF)_{2}PF_{6} compound.
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