The properties of quantum fluctuations in strongly coupled electron-phonon systems with correlated displacement and squeezing

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	The properties of quantum fluctuations in strongly coupled electron-phonon systems with correlated displacement and squeezing
	X. F. Pang
	2001
发表期刊	Journal of Physics and Chemistry of Solids
ISSN	0022-3697
卷号	62 期号:3 页码:491-501
摘要	Influences of the non-adiabatic phonon fluctuations on the ground state, and on the minimum uncertainty principle of phonons were investigated by introducing a new state-ansatz including correlation between the displacement and squeezing of the phonons in the strongly coupled electron-phonon systems. For a large squeezing, the correlation lowers, obviously, the energy of the ground state, and increases the binding energy of the polaron when compared with the uncorrelated case. Thus the stabilization of the polarons and the stability of the systems are all enhanced. The correlation was also found to suppress the quantum reduction of the classical narrowing of the polaron band, and to weaken the tunnelling effect of the polarons, and to enhance the quantum uncertainty for the phonon coordinate due to the coupling with the electron density fluctuation. Generally, the correlated effects and new ansatz introduced here were found to be relevant for a sufficiently large squeezing in the strongly and intermediately coupled electron-phonon systems. (C) 2001 Elsevier Science Ltd. All rights reserved.
部门归属	univ elect sci & technol china, inst high energy elect, chengdu 610054, sichuan, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china. ccast, world lab, beijing 100080, peoples r china.;pang, xf (reprint author), univ elect sci & technol china, inst high energy elect, chengdu 610054, sichuan, peoples r china
关键词	Molecular-crystal Model Ground-state Bipolaronic Superconductivity Phase-diagram
URL	查看原文
WOS记录号	WOS:000167283500007
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/36769
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. F. Pang. The properties of quantum fluctuations in strongly coupled electron-phonon systems with correlated displacement and squeezing[J]. Journal of Physics and Chemistry of Solids,2001,62(3):491-501.
APA	X. F. Pang.(2001).The properties of quantum fluctuations in strongly coupled electron-phonon systems with correlated displacement and squeezing.Journal of Physics and Chemistry of Solids,62(3),491-501.
MLA	X. F. Pang."The properties of quantum fluctuations in strongly coupled electron-phonon systems with correlated displacement and squeezing".Journal of Physics and Chemistry of Solids 62.3(2001):491-501.