物理学报2011，Vol.60Issue(3)：610-619,10.
一维介观环中持续电流的电子-声子相互作用非经典效应
Non-classical state effect on the persistent current in one-dimensional mesoscopic ring with electron-phonon interaction
摘要
Abstract
Based on the efficacy of the phonon coherent state and with consideration of the non-classical effect of the squeezed state of phonon, the influence of the electron-magnon interaction and the electron-phonon interaction on the persistent current in one-dimensional mesoscopic ring is studied. Compared with the free ring, our study shows that in onedimensional mesoscopic ring, the amplitude of the persistent current exponentially diminishes due to the electron-magnon interaction. For the normal state electron, the interaction of the electron-phonon causes the persistent current to weakendce to the Debye-Waller effect. However, taking the correlation between the hopping electron states and the one-phonon coherent states into the equation, the ground energy of the mesoscopic system is declined in a large scale. In result, the persistent current In is increased substantially. On the other hand, taking the behavior of the two-phonon coherent state into account, as the effect of the squeezed states of phonons maintains the phase coherence of electrons, so the DebyeWaller attenuation is weakened effectively. Especially, when the squeezed angle is larger, because of the non-adiabatic correlation between the squeezed-phonon states and the coherent states of phonon, it causes a significant decline in the ground state energy and a significant increase in the squeezed angle, thus persistent current has a even more significant increase. It should be pointed out, that the persistent current shows period oscillation as the external magnetic flux changes. Even the external magnetic flux Φem = 0, still the persistent current of the intrinsic has (I)n ≠ 0. The system continuoues to support the equilibrium spin and charge flow, the external magnetic flux only plays the role of an adiabatic parameter.关键词
持续电流/电子-声子相互作用/声子相干态/声子压缩态效应Key words
persistent current/ electron-phonon interaction/ phonon coherent state/ squeezed phonon state引用本文复制引用
罗质华,梁国栋..一维介观环中持续电流的电子-声子相互作用非经典效应[J].物理学报,2011,60(3):610-619,10.基金项目
国家自然科学基金(批准号:10574163)资助的课题. （批准号:10574163）
