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arXiv 2409.04848cond-mat.supr-concond-mat.mes-hall
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拓扑约瑟夫森结中的平面霍尔超电流与δϕ位移

Planar Hall supercurrent and δϕ-shift in the topological Josephson junction

Morteza Salehi

AI总结:

本文理论研究了三维拓扑绝缘体表面超导/铁磁约瑟夫森结,揭示面内磁化诱导的平面霍尔超电流、自旋转移力矩及反常δϕ结和π位移,为拓扑量子器件提供新机制。

摘要:

我们从理论上研究了三维拓扑绝缘体表面上由超导体和铁磁体构成的约瑟夫森结。我们采用Bogoliubov-deGennes形式体系,证明面内磁化会在Andreev模式的上行与下行布居之间产生差异,并产生平面霍尔超电流。由于Dirac费米子的强自旋轨道相互作用,超电流的弯曲会对结施加自旋转移力矩。我们建立了一个理论,并证明了平面霍尔超电流与自旋转移力矩之间的关系。面内磁化的平行分量会产生一种反常超电流,即使在零超导相位差下也能流动,并形成δϕ结。我们证明在某个范围内,即π/2d ≤ m_y ≤ π/d,约瑟夫森超电流中存在π位移。这项研究推进了我们对三维拓扑绝缘体中量子输运的理解,并突显了它们在新兴量子技术中的潜力。

英文摘要:

We theoretically investigate Josephson junctions comprising superconductors and ferromagnets on the surface of three-dimensional topological insulators. We use Bogoliubov-deGennes formalism and show the in-plane magnetization creates a difference between the upward and downward population of Andreev modes and produces a planar Hall supercurrent. Due to the strong spin-orbit interaction of Dirac fermions, bending on the supercurrent imposes a spin transfer torque on the junction. We develop a theory and demonstrate the relation between planar Hall supercurrent and spin transfer torque. The parallel component of in-plane magnetization creates an anomalous supercurrent that can flow even in zero superconducting phase difference and make $δϕ$-junction. We show in some range,$π/2d \leq m_y \leq π/d$, there is a $π$ shift in the Josephson supercurrent. This research advances our understanding of quantum transport in 3DTIs and highlights their potential in emerging quantum technologies.

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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