具有在位势的一维双原子链中杂质引起的局域振动  

The local vibration mode induced by an impurity atom in a diatomic linear chain with on-site potential

作　　者：吕岿[1] 童国平[2] 毛杰健[1] 

机构地区：[1]江西上饶师范学院物电系,上饶334001 [2]浙江师范大学数理与信息工程学院,金华321004

出　　处：《原子与分子物理学报》2012年第1期157-162,共6页Journal of Atomic and Molecular Physics

基　　金：江西省自然科学基金(2009GZW0026)

摘　　要：对具有在位势且含杂质的一维双原子链的晶格振动方程组进行求解,得到了局域振动的解析解,给出了在位势对局域振动影响的基本特征,并简要讨论了局域模的存在形式.通过研究发现,在位势的存在使得杂质产生的高频模和隙模的频率升高,局域性变好,于一定条件下在声学支内和光学支内产生新的局域模,从而显著影响了晶格局域振动的色散关系.The lattice vibration equations of a diatomic chain with an impurity atom and on-site potential are solved. The analytic solutions of local vibration are obtained. The basic features of the effect of onsite potential on the local vibration are given, and the existence forms of localized mode are also discussed. With the on-site potential existence, it is found that the frequency of the high frequency mode and gap vibration mode increase, the degree of locality get better and the new local vibration mode are generated in the acoustic branch and optical branch, which means the disperse relation of the lattice vibration is effected markedly by the on-site potential.

关 键 词：杂质 在位势 局域模 

分 类 号：O481[理学—固体物理]