Manipulation of spin filtering effect in a hybrid magnetic–electric-barrier nanostructure with a δ-doping
| Autor: | Xue-Li Cao, Meng-Rou Huang, Xin-Hong Huang, Yong-Long Zhou, Dong-Hui Liang, Mao-Wang Lu |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Condensed matter physics Spins Spin polarization business.industry Doping Heterojunction 02 engineering and technology General Chemistry Electron 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Condensed Matter::Materials Science Semiconductor 0103 physical sciences Condensed Matter::Strongly Correlated Electrons General Materials Science 010306 general physics 0210 nano-technology business Molecular beam epitaxy |
| Zdroj: | Applied Physics A. 124 |
| ISSN: | 1432-0630 0947-8396 |
| Popis: | 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 δ-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–Bűttiker 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 δ-doping is included inside. The behavior of spin-polarized electrons is related closely to the δ-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 δ-doping, which gives rise to a structurally controllable spin filter. |
| Databáze: | OpenAIRE |
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