%0 Journal Article
%T Energy levels of a polaron in wurtzite nitride parabolic quantum well under external electric field
外电场作用下纤锌矿氮化物抛物量子阱中极化子能级
%A Zhao Feng-Qi
%A Zhou Bing-Qing
%A
赵凤岐
%A 周炳卿
%J 物理学报
%D 2007
%I
%X The energy levels of a polaron in a wurtzite nitride finite parabolic quantum well(PQW)are studied by a modified Lee-Low-Pines variational method.The ground state of the polaron,the transition energy from first exited state to the ground state and the contribution from different branches of LO(TO)-like phonon modes on energy levels as functions of the well width L and external electric field F in the wurtzite GaN/Al_xGa_ 1-xN PQW are given.The effects of the anisotropy of confined LO(TO)-like phonon modes,the half-space LO(TO)-like phonon modes,the spatial dependence(SD)of effective mass,dielectric constant,phonon frequency,and external electric field on energy levels are considered in the calculation.The results show that the electron-phonon interaction,SD effects and external electric field strongly affect energy levels of a polaron in wurtzite nitride PQW,all of them tend to lower the polaron energy levels.The SD effect decreases with increasing well width L,and finally approaches to zero.The influence of confined LO-like phonon modes on polaron energy levels is greater at large well width,whereas the influence of half-space LO-like phonon modes is smaller,and the situation is reversed at a small well width.The contributions of the electron-phonon interaction to ground state energy of the polaron in wurtzite GaN/Al_xGa_ 1-xN PQW(roughly from 28 to 42 meV)are greater than that in GaAs/Al_xGa_ 1-xAs PQW(roughly from 0.5 to 3.2 meV).In addition,the contribution of the TO-like phonon modes to polaron energy levels is very small and far smaller than that of the LO-like phonon modes.Therefore,the electron-LO-like phonon interaction should be considered while the electron-TO-like phonon interaction can be neglected in studying the electron states in GaN/Al_xGa_ 1-xN PQW.
%K nitride parabolic quantum well
%K electron-phonon interaction
%K polaron
氮化物抛物量子阱
%K 电子-声子相互作用
%K 极化子
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6e709dc38fa1d09a4b578dd0906875b5b44d4d294832bb8e&cid=47ea7cfddebb28e0&jid=29df2cb55ef687e7efa80dfd4b978260&aid=8fd1084dadabb9fa&yid=a732af04dda03bb3&vid=014b591df029732f&iid=5d311ca918ca9a03&sid=541e3c5421baa5e4&eid=67c1a659302cf7d2&journal_id=1000-3290&journal_name=物理学报&referenced_num=4&reference_num=52