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arXiv 2104.12181cond-mat.mes-hallcond-mat.mtrl-sci
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纳米尺度器件中的交错自旋-轨道相互作用

Staggered spin-orbit interaction in a nanoscale device

L. C. Contamin, T. Cubaynes, W. Legrand, M. Marganska, M. M. Desjardins, M. Dartiailh, Z. Leghtas, A. Thiaville, S. Rohart, A. Cottet, M. R. Delbecq, T. Kontos

AI总结:

本文提出利用两个磁性纹理栅极在碳纳米管双量子点中诱导合成自旋-轨道相互作用,并借助微波腔实现纳米尺度畴壁与交错耦合。

摘要:

载流子自旋与运动的耦合直接源于导体的原子结构。它已成为拓扑物质,尤其是拓扑超导性涌现的重要因素,而拓扑超导性可能容纳非阿贝尔激发,例如 Majorana 模或 parafermion。这些模式主要在由重原子构成的半导体平台中寻找,因此这类平台天然表现出较大的自旋-轨道相互作用。在纳米尺度上创建自旋-轨道相互作用的畴壁,可能成为工程化构建适用于通用拓扑量子计算的拓扑激发的关键资源。例如,已有研究提出将其用于探索奇异电子态或创建铰链态。然而,在天然平台中实现这一点仍是一项挑战。在本工作中,我们展示了如何通过由两个光刻图案化的磁性纹理栅极诱导的合成自旋-轨道相互作用,以另一种方式实现该目标。我们在一种轻质材料——碳纳米管——中使用嵌入微波腔的双量子点,利用微波光子触发两个相邻轨道之间的跃迁,并通过光-物质耦合直接比较被畴壁分隔的波函数。我们表明,可以实现工程化的交错自旋-轨道相互作用,其强度变化大于两个位点之间的跃迁能量。

英文摘要:

The coupling of the spin and the motion of charge carriers stems directly from the atomic structure of a conductor. It has become an important ingredient for the emergence of topological matter, and, in particular, topological superconductivity which could host non-abelian excitations such as Majorana modes or parafermions. These modes are sought after mostly in semiconducting platforms which are made of heavy atoms and therefore exhibit naturally a large spin-orbit interaction. Creating domain walls in the spin orbit interaction at the nanoscale may turn out to be a crucial resource for engineering topological excitations suitable for universal topological quantum computing. For example, it has been proposed for exploring exotic electronic states or for creating hinge states. Realizing this in natural platforms remains a challenge. In this work, we show how this can be alternatively implemented by using a synthetic spin orbit interaction induced by two lithographically patterned magnetically textured gates. By using a double quantum dot in a light material -- a carbon nanotube -- embedded in a microwave cavity, we trigger hopping between two adjacent orbitals with the microwave photons and directly compare the wave functions separated by the domain wall via the light-matter coupling. We show that we can achieve an engineered staggered spin-orbit interaction with a change of strength larger than the hopping energy between the two sites.

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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