一维电声系统中的自旋-电荷分离  

Spin-charge separation in one-dimensional electron-phonon systems

作　　者：赵晖[1] 宁文强[1] 吴长勤[1] 林海青[2] 

机构地区：[1]复旦大学物理系,上海200433 [2]香港中文大学物理系

出　　处：《物理》2006年第11期911-912,共2页Physics

基　　金：国家自然科学基金(批准号:90403110);CUHK基金(批准号:4015047)资助项目

摘　　要：文章作者结合团簇微扰理论和优化声子基近似的方法,通过单电子谱函数的计算,研究了一维关联系统中声子效应对自旋-电荷分离的影响,发现由于有限声子频率带来的推迟效应抑制自旋-电荷分离,使之在谱函数中不可见,同时还得到电子对和极化子劈裂的信息.Phonon effects on spin - charge separation in one dimension are investigated through the calculation of one - electron spectral functions in terms of the recently developed cluster perturbation theory together with an optimized phonon approach. It is found that the retardation effect due to the finiteness of phonon frequency suppresses the spin - charge separation and eventually makes it invisible in the spectral function. Signatures of electron pairing and polaron splitting in the spectral function are also observed.

关 键 词：自旋-电荷分离 电声相互作用 单电子谱函数 

分 类 号：O481[理学—固体物理]