2007/09/03 by Jun-Feng Liu, Zhicheng Zhong, Zhi-Cheng Zhong +4 · 37 citations
Chemistry · Physics and Astronomy · #Chemistry #Condensed matter physics #Constriction #Coupling (piping) #Electron #Magnetic properties of thin films #Materials science #Optics #Physics #Physics of Superconductivity and Magnetism #Polarization (electrochemistry) #Quantum #Quantum and electron transport phenomena #Quantum mechanics #Scattering #Spin (aerodynamics) #Spin polarization #Spin–orbit interaction #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.76.195304
published in Physical Review B 76(19) (American Physical Society) · 8 pages, 7 figures
arxiv created 2007/09/03 · openalex publication_date 2007/11/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the enhancement of spin polarization in a quantum wire in the presence of a constriction and a spin-orbit coupling segment. It is shown that the spin-filtering effect is significantly heightened in comparison with the configuration without the constriction. It is understood in the studies that the constriction structure plays a critical role in enhancing the spin filtering by means of confining the incident electrons to occupy one channel only while the outgoing electrons occupy two channels. The enhancement of spin filtering has also been analyzed within the perturbation theory. Because the spin polarization arises mainly from the scattering between the constriction and the segment with spin-orbit coupling, the subband mixing induced by spin-orbit interaction in the scattering process and the inferences result in higher spin-filtering effect.