Coherent interaction and action–counteraction theory in small polaron systems,and ground state properties  

作　　者：Zhi-Hua Luo Chao-Fan Yu 罗质华;余超凡(School of Physics and Information Engineering,Guangdong University of Education,Guangzhou 510303,China)

机构地区：[1]School of Physics and Information Engineering,Guangdong University of Education,Guangzhou 510303,China

出　　处：《Chinese Physics B》2022年第11期474-481,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.10574163)。

摘　　要：Based on the coherent interaction and action–counteraction principles,we investigate the ground state properties for small polaron systems,the coherent-squeezed fluctuation correction,and the anomalous lattice quantum fluctuation,with the new variational generator containing correlated squeezed-coherent coupling and quantum entanglement.Noting tha t-2t is the T.B.A.energy,for the coherent interaction effect,we find the ground-state energy E_(0)to be-2.428t,in which the coherent squeezed fluctuation correction-A_(0)t is-0.463t(where t is the hopping integral,ωis the phonon frequency),with the electron–one-phonon coupling constant g=1 and the electron–two-phonon coupling constant g_(1)=-0.1.However,as a result of the action–counteraction effect,E_(0)is-2.788t,but-E_(0)t is-0.735t.As to the polaron binding energy(EP),for the coherent interaction effect,E_(P) is-1.38ω,but for the action–counteraction effect,E_(P) is-1.88ω.In particular,the electron–two-phonon interaction noticeably enlarges the coherent interaction and the coherent squeezed quantum fluctuation correction.By intervening with the quantum entanglement,the evolutions of the squeezed coherent state and the lattice quantum fluctuation begin to take control.At that time,we encounter a new quantum phase coherence phenomenon—the collapse and revival of inversion repeatedly for the coherent state in the entangled evolution.

关 键 词：coherent interaction and action-counteraction correlated representation variational approach entangled-squeezed coherent state interaction of electron with the coherent squeezed fluctuation 

分 类 号：O469[理学—凝聚态物理]