Manipulation of spin filtering effect in a hybrid magnetic-electric-barrier nanostructure with a -doping

作者：Zhou, Yong-Long; Lu, Mao-Wang^*; Cao, Xue-Li; Huang, Xin-Hong; Huang, Meng-Rou; Liang, Dong-Hui

来源：Applied Physics A, 2018, 124(10): 705.

DOI：10.1007/s00339-018-2125-0

• SEMICONDUCTOR NANOSTRUCTURE
• TRANSPORT
• SPLITTER
• POLARIZATION
• SPINTRONICS
• STATES

By means of a hybrid magnetic-electric barrier (MEB) on the top of the semiconductor InAs/AlxIn1-xAs heterostructure, a spin filter can be obtained. In this work, we introduce a -doping into this MEB device by molecular beam epitaxy or metal-organic chemical-vapor deposition, to manipulate the spin filtering. With the help of the improved transfer-matrix method and Landauer-Bttiker theory, transmission coefficient, conductance and spin polarization are calculated for the electrons across this device. Due to spin-field interaction between electron spins and magnetic fields, an obvious spin filtering effect remains in the device even if a -doping is included inside. The behavior of spin-polarized electrons is related closely to the -doping, due to the strong dependence of the effective potential experienced by the electrons on such a doping. Degree of spin polarization can be manipulated by properly adjusting weight or position of the -doping, which gives rise to a structurally controllable spin filter.

• 出版日期2018-10
• 单位桂林理工大学