侧向耦合量子点的量子线的自旋输运  

Electron Transport Through a Quantum Wire Side-coupled to a Ferromagnetic Lead

作　　者：葛森权[1] 熊永建[1] 

机构地区：[1]宁波大学理学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2008年第4期557-560,共4页Journal of Ningbo University：Natural Science and Engineering Edition

摘　　要：提出了理想量子线通过量子点与铁磁导线侧向耦合系统,可实现电子自旋极化输运.并通过格林函数法计算表明:量子线上的电导产生自旋极化;电导极化率在反共振区有2个峰值,且与非共振区的极化方向相反;调整量子点和铁磁导线的耦合强度参数可使电导极化率达到极值.A perfect quantum wire side-coupled to a ferromagnetic lead via an interacting quantum dot is studied to achieve spin transport. By the Green function＇s theory the conductance through the quantum wire is spin polarized. The conductance polarization reveals two peaks in resonant region with the orientation opposite to that in the nonresonant region. The maximum of conductance polarization can be implemented by tuning the coupling between the quantum dot and the ferromagnetic lead.

关 键 词：量子线 量子点 自旋输运 

分 类 号：O488[理学—固体物理]