电子-声子相互作用对金属介观环中持续电流的影响

Persistent Current in a Metallic Ring With Consideration of Electron Phonon Interaction

在连续模型中研究了电子－声子相互作用对一维金属介观环中由磁通Φ诱发的持续电流的贡献．持续电流随磁通Φ的变化具有周期性．周期为磁通量子Φ０＝ｈ／ｅ．研究表明，电子－声子相互作用不仅降低系统能量而且对持续电流有抑制作用．持续电流与系统中的电子数（Ｎ）有明显的依赖关系．当（Ｎ）增加到足够大时，持续电流趋于零．

The persistent current is studied in a continuous model for a one dimensional mesoscopic ring threaded by a flux Φ , with consideration of the electron phonon interaction. The current is periodic in Φ with a flux quantum Φ 0 . The electron phonon interaction lowers the total energy and suppresses the persistent current of the system. The persistent current is strongly dependent on the number N of electrons in the system and tends to be zero when N is large enough.