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LOCALIZED EXCITATIONS IN COMPETING BOND-ORDER-WAVE, CHARGE-DENSITY-WAVE, AND SPIN-DENSITY-WAVE SYSTEMS
WANG, CL; WANG, WZ; GU, GL; SU, ZB; YU, L; WANG, CL , CHINA CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
1993
发表期刊PHYSICAL REVIEW B
ISSN0163-1829
卷号48期号:15页码:10788-10803
摘要The characteristics of localized excitations in quasi-one-dimensional systems are rather sensitive to the interplay between the electron-phonon (e-ph) and electron-electron (e-e) interactions giving rise to competition and possible coexistence of various symmetry-broken ground states such as the bond-order wave (BOW), the charge-density wave (CDW), and the spin-density wave (SDW). Such effects are observable in halogen-bridged mixed-valence transition-metal complexes and can be elucidated within the Bogoliubov-de Gennes formalism using an extended Peierls-Hubbard model. The coexistence of local BOW, CDW, and SDW distortions is demonstrated in this paper for polarons and self-trapped excitons (STE) in different symmetry-broken ground states. An extensive study of localized excitations over a wide range of the on-site e-ph coupling lambda2 and the Hubbard interaction U leads to the following observations. (a) As lambda2 increases at fixed U, the number of bound states inside the gap changes from two to four for the STE case and from two to three for the polaron case. (b) Upon its further increase, one type of STE with a certain pattern of SDW distortion and charge transfer is transforming into another type of STE with a different pattern. (c) A nonmonotonic dependence of the lattice relaxation energy on lambda2 is predicted within the lattice relaxation approach developed by Su and Yu earlier, and is attributed to a crossover from the weak-coupling to strong-coupling behavior showing up as the emergence of new bound states inside the gap. Moreover, the nonradiative transition rate of STE is also calculated and is used to tentatively interpret the very short lifetime of STE in PtCl complexes. Such nonmonotonic dependence of the relaxation rate on the coupling constant may also be observed in other quasi-one-dimensional systems as well.
部门归属ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA; INT CTR THEORET PHYS,I-34100 TRIESTE,ITALY
关键词Bridged Mixed-valence Peierls-hubbard Model N-electrons System Nonlinear Lattice-relaxation Wolffram Red Salt Metal-complexes Transfer Crystals Phase-diagram Free State Halogen
学科领域Physics
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收录类别SCI
WOS记录号WOS:A1993MD74500015
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被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/11995
专题理论物理所SCI论文
通讯作者WANG, CL , CHINA CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
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WANG, CL,WANG, WZ,GU, GL,et al. LOCALIZED EXCITATIONS IN COMPETING BOND-ORDER-WAVE, CHARGE-DENSITY-WAVE, AND SPIN-DENSITY-WAVE SYSTEMS[J]. PHYSICAL REVIEW B,1993,48(15):10788-10803.
APA WANG, CL,WANG, WZ,GU, GL,SU, ZB,YU, L,&WANG, CL , CHINA CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA..(1993).LOCALIZED EXCITATIONS IN COMPETING BOND-ORDER-WAVE, CHARGE-DENSITY-WAVE, AND SPIN-DENSITY-WAVE SYSTEMS.PHYSICAL REVIEW B,48(15),10788-10803.
MLA WANG, CL,et al."LOCALIZED EXCITATIONS IN COMPETING BOND-ORDER-WAVE, CHARGE-DENSITY-WAVE, AND SPIN-DENSITY-WAVE SYSTEMS".PHYSICAL REVIEW B 48.15(1993):10788-10803.
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