A structurally-controllable spin filter in a delta-doped magnetically modulated semiconductor nanostructure with zero average magnetic field

作者：Shen, Li Hua; Ma, Wen Yue; Zhang, Gui Lian^*; Yang, Shi Peng

来源：Physica E: Low-Dimensional Systems and Nanostructures , 2015, 71: 39-42.

DOI：10.1016/j.physe.2015.03.021

• Magnetically modulated semiconductor nanostructure
• The delta-doping
• Spin polarization
• Tunable spin filter

We report on a theoretical investigation of spin-polarized transport in a delta-doped magnetically modulated semiconductor nanostructure, which can be experimentally realized by depositing a ferromagnetic stripe on the top of a semiconductor heterostructure and by using the atomic layer doping technique such as molecular beam epitaxy (MBE). It is shown that although such a nanostructure has a zero average magnetic filed, a sizable spin polarization exists due to the Zeeman splitting mechanism. It is also shown that the degree of spin polarization varies sensitively with the weight and/or position of the delta-doping. Therefore, one can conveniently tailor the behaviour of the spin polarized electron by tuning the delta -doping, and such a device can be employed as a controllable spin filter for spintronics.

• 出版日期2015-7
• 单位邵阳学院