超导结中的单一对映体自旋极化器
Single-enantiomer spin polarisers in superconducting junctions
AI总结：
通过用锰原子团簇功能化扫描隧道显微镜的超导尖端，利用Yu-Shiba-Rusinov共振作为自旋敏感探针，在单heptahelicene分子吸附于晶体铅表面的结中，实验证明了手性诱导的自旋选择性效应，并揭示了信号强度对分子手性的依赖。
摘要：
在手性物质作为偏压电子输运中的自旋选择性器件，因其在微型化电子器件的量子技术设计中的潜力而受到关注。然而，迄今为止，关于自旋选择性的实验报道尚无定论。在铁磁体上，手性材料在磁化反转时观察到的电子输运测量中的磁阻被认为是由静电效应而非所寻求的手性效应引起的。最近的断裂结研究甚至质疑了单手性分子中自旋相关的电子流。在这里，我们避免了铁磁电极和磁化反转，为单一对映体的手性诱导自旋选择性效应提供了明确的实验证据。用锰原子团簇功能化扫描隧道显微镜的超导尖端，产生了Yu-Shiba-Rusinov共振，这些共振作为自旋敏感探针，用于探测吸附在晶体铅表面的单heptahelicene分子结中的隧穿电流。我们的关键发现是，在微分电导谱中，这些态的信号强度依赖于分子的手性。实验揭示了在对映体作为自旋极化器的作用以及所选模型系统中静电效应的无关性。
英文摘要：
Chiral matter acting as a spin-selective device in biased electron transport is attracting attention for the quantum-technological design of miniaturized electronics. To date, however, experimental reports on spin selectivity are not conclusive. The magnetoresistance in electron transport measurements observed for chiral materials on ferromagnets upon magnetisation reversal is proposed to result from electrostatic rather than from the sought-after chiral effects. Recent break junction studies even question the spin-dependent electron flow across single chiral molecules. Here, we avoid ferromagnetic electrodes and magnetisation reversal to provide unambiguous experimental evidence for the chirality-induced spin selectivity effect of single enantiomers. Functionalising the superconducting tip of a scanning tunnelling microscope with a manganese atom cluster gives rise to Yu-Shiba-Rusinov resonances that serve as spin-sensitive probes of the tunnelling current in junctions of single heptahelicene molecules adsorbed on a crystalline lead surface. Our key finding is the dependence of the signal strength of these states in spectroscopy of the differential conductance on the handedness of the molecule. The experiments unveil the role of the enantiomers as spin polarisers and the irrelevance of electrostatics in the chosen model system.
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