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题名: LOCALIZED EXCITATIONS IN COMPETING BOND-ORDER-WAVE, CHARGE-DENSITY-WAVE, AND SPIN-DENSITY-WAVE SYSTEMS
作者: WANG, CL ;  WANG, WZ ;  GU, GL ;  SU, ZB ;  YU, L
刊名: PHYSICAL REVIEW B
出版日期: 1993
卷号: 48, 期号:15, 页码:10788-10803
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
学科分类: Physics
通讯作者: WANG, CL , CHINA CTR ADV SCI & TECHNOL,WORLD LAB,POB 8730,BEIJING 100080,PEOPLES R CHINA.
部门归属: ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA; INT CTR THEORET PHYS,I-34100 TRIESTE,ITALY
英文摘要: 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.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:A1993MD74500015
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/11995
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
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.
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