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arXiv 1502.07871cond-mat.mes-hall
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三维拓扑绝缘体表面结中输运的赝自旋阀效应

Pseudospin-valve effect on transport in junctions of three-dimensional topological insulator surfaces

Sthitadhi Roy, Krishanu Roychowdhury, Sourin Das

摘要:

我们表明,原始的3D拓扑绝缘体(TI)的表面状态是类似的铁磁半金属由于一个出射动量独立的赝自旋(SU(2))自由度的表面上的完全极化。为了使这一主张站稳脚跟,我们提出了垂直于晶体生长轴的TI表面的结果,这清楚地表明,相同TI材料的两个这样的TI表面之间的隧穿电导是由这种半金属行为主导的,导致物理学让人想起自旋阀。进一步利用本文导出的广义隧道磁电阻,我们还研究了任意TI表面之间的隧穿电流。我们还进行了全面的研究,所有可能的表面电位允许时间反演对称性对这种自旋阀效应的影响,并表明它是强大的对大多数这样的潜力。

英文摘要:

We show that the surface states of pristine 3D topological insulators (TIs) are analogs of ferromagnetic half metals due to complete polarization of an emergent momentum independent pseudospin (SU(2)) degree of freedom on the surface. To put this claim on firm footing, we present results for TI surfaces perpendicular to the crystal growth axis, which clearly show that the tunneling conductance between two such TI surfaces of the same TI material is dominated by this half metallic behavior leading to physics reminiscent of a spin-valve. Further using the generalized tunnel magnetoresistance derived in this work we also study the tunneling current between arbitrary TI surfaces. We also perform a comprehensive study of the effect of all possible surface potentials allowed by time reversal symmetry on this spin-valve effect and show that it is robust against most of such potentials.

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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