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arXiv 2410.02018cond-mat.mes-hall
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通过吸附原子操控实现电荷密度波调控及其对磁性纳米结构的影响

Charge-density-wave control by adatom manipulation and its effect on magnetic nanostructures

Lisa M. Rütten, Eva Liebhaber, Kai Rossnagel, Katharina J. Franke

AI总结:

本研究利用STM针尖操控吸附原子实现2H-NbSe2中电荷密度波畴的可逆切换,并发现该畴结构影响YSR态杂化,为调控超导自旋链及拓扑超导性提供新途径。

摘要:

电荷密度波(CDW)是物质的相关态,其中电子密度因电子-声子相互作用而周期性调制。通常,CDW相与其他相关态(如超导、自旋密度波或莫特绝缘体)共存。因此,调控CDW相可能实现对这些相互作用态能量景观的操控。2H-NbSe$_2$是过渡金属二硫族化物(TMDC)中同时承载CDW序和超导性的典型例子。该CDW具有非公度性质,导致原子尺度上CDW与晶格存在不同的对齐方式。在此,我们利用扫描隧道显微镜(STM)的针尖在表面定位吸附原子,并诱导CDW畴的可逆切换。我们展示了畴结构对其他局域相互作用(即Yu-Shiba-Rusinov(YSR)态的杂化)的关键影响,这些态源于磁性Fe原子与超导体之间的交换相互作用。我们的结果表明,CDW操控也可用于在超导体上的耦合自旋链中引入畴壁,这可能进一步影响拓扑超导性。

英文摘要:

Charge-density waves (CDWs) are correlated states of matter, where the electronic density is modulated periodically as a consequence of electronic and phononic interactions. Often, CDW phases coexist with other correlated states, such as superconductivity, spin-density waves or Mott insulators. Controlling CDW phases may therefore enable the manipulation of the energy landscape of these interacting states. 2H-NbSe$_2$ is a prime example of a transition metal dichalcogenide (TMDC) hosting CDW order and superconductivity. The CDW is of incommensurate nature resulting in different CDW-to-lattice alignments at the atomic scale. Here, we use the tip of a scanning tunneling microscope (STM) to position adatoms on the surface and induce reversible switching of the CDW domains. We show that the domain structure critically affects other local interactions, namely the hybridization of Yu-Shiba-Rusinov (YSR) states, which arise from exchange interactions of magnetic Fe atoms with the superconductor. Our results suggest that CDW manipulation could also be used to introduce domain walls in coupled spin chains on superconductors, potentially also affecting topological superconductivity.

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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