Based on the transfer matrix method, we investigate the effects of Rashba spin-orbit interaction and magnetic field on the electron transport in a quasi one-dimensional FM/S/FM system, where FM and S represent the fer...Based on the transfer matrix method, we investigate the effects of Rashba spin-orbit interaction and magnetic field on the electron transport in a quasi one-dimensional FM/S/FM system, where FM and S represent the ferromagnetic metal and semiconductor, respectively. The results show that the oscillating scope of the transmission increases with the magnetic field increasing. In the antiferromagnetic alignment, the spin-up and spin-down electrons make the same contribution to the transmission even if a magnetic field is applied. In the ferromagnetic alignment, however, at certain strengths of Rashba spin-orbit interaction and of magnetic field, the transmission coefficient for spin-up electrons is larger than that for spin-down electrons, and the sign of the spin polarization changes, which is opposite to that in the absence of the magnetic field.展开更多
Using the tight-binding model approximation, this paper investigates theoretically spin-dependent quantum trans- port through an Aharonov–Bohm (AB) interferometer. An external magnetic field is applied to produce the...Using the tight-binding model approximation, this paper investigates theoretically spin-dependent quantum trans- port through an Aharonov–Bohm (AB) interferometer. An external magnetic field is applied to produce the spin- polarization and spin current. The AB interferometer, acting as a spin splitter, separates the opposite spin polarization current. By adjusting the energy and the direction of the magnetic field, large spin-polarized current can be obtained.展开更多
文摘Based on the transfer matrix method, we investigate the effects of Rashba spin-orbit interaction and magnetic field on the electron transport in a quasi one-dimensional FM/S/FM system, where FM and S represent the ferromagnetic metal and semiconductor, respectively. The results show that the oscillating scope of the transmission increases with the magnetic field increasing. In the antiferromagnetic alignment, the spin-up and spin-down electrons make the same contribution to the transmission even if a magnetic field is applied. In the ferromagnetic alignment, however, at certain strengths of Rashba spin-orbit interaction and of magnetic field, the transmission coefficient for spin-up electrons is larger than that for spin-down electrons, and the sign of the spin polarization changes, which is opposite to that in the absence of the magnetic field.
基金Supported by the National Natural Science Foundation of China under Grant No 10674040 and the Natural Science Foundation of Hebei Province under Grant No A2007000227.
基金Project supported by the National Natural Science Foundation of China (Grant No 10674040)the Natural Science Foundation of Hebei Province, China (Grant No A2007000227
文摘Using the tight-binding model approximation, this paper investigates theoretically spin-dependent quantum trans- port through an Aharonov–Bohm (AB) interferometer. An external magnetic field is applied to produce the spin- polarization and spin current. The AB interferometer, acting as a spin splitter, separates the opposite spin polarization current. By adjusting the energy and the direction of the magnetic field, large spin-polarized current can be obtained.
基金Supported by the Natural Science Foundation of Hebei Province under Grant No A2005000147, and the Natural Science Foundation of Hebei Normal University.
基金Supported by the National Natural Science Foundation of China under Grant No 10974043, and the Natural Science Foundation of Hebei Province under Grant No A2009000240.
