کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1860510 | 1037436 | 2009 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Photocurrent spin diode: Electrically controlled sign reversal of current polarization Photocurrent spin diode: Electrically controlled sign reversal of current polarization](/preview/png/1860510.png)
We report a study of spin-dependent transport through a quantum dot irradiated by continuous circularly polarized light resonant to the electron–heavy hole transition. We use the nonequilibrium Green's function to calculate the spin accumulation, spin-resolved currents, and current polarization in the presence of an external bias and intradot Coulomb interaction. It is found that for a range of external biases sign reversal of the current polarization can be modulated. The system thus operates as a rectifier for spin current polarization. This effect follows from the interplay between the external irradiation and the Coulomb repulsion. The spin-polarized transport through a three-terminal device is also discussed. Spin current with high polarization could be obtained due to spin filter effect.
Journal: Physics Letters A - Volume 374, Issue 1, 14 December 2009, Pages 91–96