Properties of nonadiabatic quantum fluctuations of the strongly coupled electron-phonon systems

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	Properties of nonadiabatic quantum fluctuations of the strongly coupled electron-phonon systems
	X. F. Pang
	2008
发表期刊	Science in China Series G-Physics Mechanics & Astronomy
ISSN	1672-1799
卷号	51 期号:3 页码:258-268
摘要	A new variational-ansatz of states of electrons and phonons was proposed on the basis of the Holstein model in strongly coupled electron-phonon systems for studying the influence of nonadiabatic phonon fluctuation, arising from the motion and density fluctuation of electrons, on the properties of ground state, uncertainty relation, stability of polarons, charge density wave (CDW) and phonon staggered ordering. The new ansatz represents the correlation among the displacement and squeezing states of phonons and polaron's state of electrons as well as the squeezing-antisqueezing effect. The correlation and squeezing-antisqueezing effect result in the decrease of ground state energy, enhancement of stability of the systems, increase of binding energy of the polarons, weakening of the growing speed of polaron narrowing of the electron band, increase of the charge density wave order and suppression of the increased tendency of anomalous quantum fluctuation of the phonons in such a case, when compared with the uncorrelated case in the systems. The results obtained show that the ground state determined by the new state ansatz is most stable, thus the new ansatz describing the properties of the coupled electron phonon systems is very relevant and available, especially in strongly coupled and largely squeezed cases.
部门归属	[pang xiaofeng] univ elect sci & technol china, inst life sci & technol, chengdu 610054, peoples r china. [pang xiaofeng] chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china.;pang, xf (reprint author), univ elect sci & technol china, inst life sci & technol, chengdu 610054, peoples r china;pangxf@mail.sc.cninfo.net
关键词	Squeezing-antisqueezing Effect State-ansatz Polaron Coupled Electron-phonon Systems Quantum Fluctuation Molecular-crystal Model Squeezed-state Approach Ground-state Correlated Displacement Holstein Model Phase-diagram Polaron Transition Dynamics Mobility
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WOS记录号	WOS:000253756000006
引用统计	被引频次：2[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/321006/33044
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. F. Pang. Properties of nonadiabatic quantum fluctuations of the strongly coupled electron-phonon systems[J]. Science in China Series G-Physics Mechanics & Astronomy,2008,51(3):258-268.
APA	X. F. Pang.(2008).Properties of nonadiabatic quantum fluctuations of the strongly coupled electron-phonon systems.Science in China Series G-Physics Mechanics & Astronomy,51(3),258-268.
MLA	X. F. Pang."Properties of nonadiabatic quantum fluctuations of the strongly coupled electron-phonon systems".Science in China Series G-Physics Mechanics & Astronomy 51.3(2008):258-268.