巡游电子系统中电子－声子相互作用对磁性激发的影响  

INFLUENCE OF INTERACTION BETWEEN ELECTRONS AND PHONONS ON THE MAGNETIC EXCITATION OF ITINERANT ELECTRONS SYSTEM

作　　者：余超凡[1] 陈斌[1] 何国柱[1] 

机构地区：[1]南开大学物理系,南开大学数学研究所

出　　处：《物理学报》1994年第5期839-845,共7页Acta Physica Sinica

摘　　要：从Ｐｅｉｅｔｌｓ－Ｈｕｂｂａｒｄ哈密顿量出发，讨论了电子－声子相互作用对巡游电子系统磁性激发的影响。结果表明，电子－声子相互作用，不仅改变了Ｘ￣（－＋）（ｑ，ω）的动力学特性，而且在系统能带结构中，使两个自旋子带分裂减小，从而更有利于电子－空穴对的个别激发；另一方面，电－声子相互作用导致自旋波激发出现能隙。Based on the Peierls-Hubbard Hamiltonian,the influence of electron-phonon inte-raction on the spin excitation of itinerant electron system has been analysed. It isshown that the interaction not only changes the dynamic property of X￣+(q,ω),butalso causes the gap between two spin subbands to become narrow, which makes theelectron-hole pairs easy to be excited singly.It should be emphasized that the spinexcitation spectrum has an energy gap duo to the presence of above-mentionedelectron-phonon interaction.

关 键 词：电子 声子 耦合 超导性 磁性 

分 类 号：O511.1[理学—低温物理]