EXTENDED PEIERLS-HUBBARD MODEL FOR ONE-DIMENSIONAL N-SITES N-ELECTRONS SYSTEM .1. PHASE-DIAGRAM BY MEAN FIELD-THEORY
EXTENDED PEIERLS-HUBBARD MODEL FOR ONE-DIMENSIONAL N-SITES N-ELECTRONS SYSTEM .1. PHASE-DIAGRAM BY MEAN FIELD-THEORY
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DOI：
10.1143/jpsj.52.3865
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发表时间：
1983-01-01
影响因子：
1.7
通讯作者：
NASU, K
中科院分区：
文献类型：
--
作者：
NASU, K
本文在平均场理论下，在声子绝热极限下，研究了一维多电子系统的相图，该系统具有格点对角电子-声子（e-p）耦合，格点间电子-电子（e-e）短程排斥和格点内电子-电子（e-e）短程排斥.该理论涵盖了表征体系的四个参量：电子转移能T、e-p耦合能S、位内和位间的e-e排斥能U和V的整个范围，并在T、U和V所构成的四面体坐标空间中给出了相图。证明了"T-U-S-V四面体"由界面U = S +2V分为SDW区和CDW区，即"S"与"U"竞争而与"V"合作。CDW能隙中出现的"S ParticipU"和"S ParticipT"竞争可以解释卤素桥联混合价金属配合物的实验结果。
The phase diagram of a one-dimensional many-electron system with site-diagonal electron-phonon(e-p) coupling and short-ranged inter-site electron-electron(e-e) repulsion as well as intra-site one is studied within the mean field theory for electrons and in the adiabatic limit for phonons. The theory covers the whole region of four parameters characterizing the system: the transfer energy of electronT, the e-p coupling energyS, the intra- and inter-site e-e repulsive enegiesUandV, and the phase diagram is given in a tetrahedral coordinate space spanned byT,U,SandV. It is proved that the “T-U-S-Vtetrahedron” is divided into SDW and CDW regions by the interfaceU=S+2V, that is, “S” competes with “U” but cooperates with “V”. The “S↔U” and “S↔T” competitions appeared in the energy gap of CDW can explain the experimental results of halogen-bridged mixed-valence metal complexs.