Spin Polarizations of Electron with Rashba Couplings in T-Shaped Devices: A Finite Element Approach
- 15 September 2010
- journal article
- Published by IOP Publishing in Communications in Theoretical Physics
- Vol. 54 (3), 563-572
- https://doi.org/10.1088/0253-6102/54/3/35
Abstract
A generalized finite element formulation is proposed for the study of the spin-dependent ballistic transport of electron through the two-dimensional quantum structures with Rashba spin-orbit interactions (SOI). The transmission coefficient, conductance, the total and local polarization are numerically calculated and discussed as the Rashba coefficient, the geometric sizes, and incident energy are changed in the T-shaped devices. Some interesting features are found in the proper parameter regime. The polarization has an enhancement as the Rashba coefficient becomes stronger. The polarization valley is rigid in the regime of the conductance plateaus since the local interference among the polarized multi-wave modes. The Rashba interactions coupling to geometry in sizes could form the structure-induced Fano–Rashba resonance. In the wider stub, the localized spin lattice of electron could be produced. The conductance plateaus correspond to weak polarizations. Strong polarizations appear when the stub sizes, incident energy, and the Rashba coupling coefficient are matched. The resonances are formed in a wide Fermi energy segment easily.This publication has 30 references indexed in Scilit:
- Remote-control spin filtering through a T-type structureApplied Physics Letters, 2007
- Spin filtering in a two-dimensional electron gas device with asymmetric spatially spread magnetic-electric barriersJournal of Applied Physics, 2004
- Spintronics: Fundamentals and applicationsReviews of Modern Physics, 2004
- Ballistic spin-filter transistorPhysical Review B, 2001
- Spin filtering in a magnetic–electric barrier structureApplied Physics Letters, 2001
- Large Rashba Splitting in InAs Quantum Wells due to Electron Wave Function Penetration into the Barrier LayersPhysical Review Letters, 2000
- Ballistic spin transport in a two-dimensional electron gasPhysical Review B, 2000
- Spin-interference deviceApplied Physics Letters, 1999
- Gate Control of Spin-Orbit Interaction in an Inverted IGAs/IAAs HeterostructurePhysical Review Letters, 1997
- Electronic analog of the electro-optic modulatorApplied Physics Letters, 1990