Time-Dependent Spin-Polarized Transport Through a Resonant Tunneling Structure with Multi-Terminal

Abstract

The spin-dependent transport of the electrons tunneling through a resonant tunneling structure with ferromagnetic multi-terminal under dc and ac fields is explored by means of the nonequilibrium Green function technique. A general formulation for the time-dependent current and the time-averaged current is established. As its application the systems with two and three terminals in noncollinear configurations of the magnetizations under dc and ac biases are investigated, respectively. The asymmetric factor of the relaxation times for the electrons with different spin in the central region is uncovered to bring about various behaviours of the TMR. The present three-terminal device is different from that discussed in literature, which is coined as a spin transistor with source. The current-amplification effect is found. In addition, the time-dependent spin transport for the two-terminal device is studied. It is found that the photonic sidebands provide new channels for the electrons tunneling through the barriers, and give rise to new resonances of the TMR, which is called as the photon-asisted spin-dependent tunneling. The asymmetric factor of the relaxation times is observed to lead to additional resonant peaks besides the photon-asisted resonances.

32 pages,14 figures

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Cited by in corpus (8)

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• Photon-assisted electron transport through a three-terminal quantum dot system with nonresonant tunneling channels
• Magnetotransport through graphene spin valves
• Transient Charging and Discharging of Spin-polarized Electrons in a Quantum Dot
• Quantum transport through a double Aharonov-Bohm-interferometer in the presence of Andreev reflection
• Magneto-transport in impurity-doped few-layer graphene spin valve
• Time-dependent magneto-transport in a driven graphene spin valve
• Quantum Oscillations of Tunnel Magnetoresistance Induced by Spin-Wave Excitations in Ferromagnet-Ferromagnet-Ferromagnet Double Barrier Tunnel Junctions