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arXiv 1302.5243cond-mat.mtrl-scicond-mat.mes-hall
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利用可变肖特基势垒调谐Pb量子阱态中的Rashba效应

Tuning of the Rashba effect in Pb quantum well states via a variable Schottky barrier

Bartosz Slomski, Gabriel Landolt, Gustav Bihlmayer, Jürg Osterwalder, J. Hugo Dil

摘要:

低维系统中的自旋-轨道相互作用(SOI)导致了自旋-动量锁定的迷人特性。在Rashba系统中,垂直于二维(2D)电子气平面的反转对称性被打破,产生费米表面自旋纹理,让人联想到不同半径的自旋涡旋。这可以在基于自旋的场效应晶体管(spin-FET)中利用,其中Rashba系统在铁磁(FM)源极和漏极电极之间形成2D沟道。当通过Rashba沟道传播时,电子自旋进动,并且自旋取向(反)平行于漏极,从而产生(低)高电导率。关键是通过外部参数来调整动量分裂,从而调整进动角的可能性。在这里,我们表明,这可以实现在铅量子阱状态通过掺杂的肖特基势垒的依赖性,开辟了太赫兹自旋FET的可能性。

英文摘要:

Spin-orbit interaction (SOI) in low-dimensional systems results in the fascinating property of spin-momentum locking. In a Rashba system the inversion symmetry normal to the plane of a two-dimensional (2D) electron gas is broken, generating a Fermi surface spin texture reminiscent of spin vortices of different radii. This can be exploited in a spin-based field-effect transistor (spin- FET), where the Rashba system forms a 2D channel between ferromagnetic (FM) source and drain electrodes. The electron spin precesses when propagating through the Rashba channel and spin orientations (anti)parallel to the drain give (low) high conductivity. Crucial is the possibility to tune the momentum splitting, and consequently the precession angle, through an external parameter. Here we show that this can be achieved in Pb quantum well states through the doping dependence of the Schottky barrier, opening up the possibility of a terahertz spin-FET.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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