Nanoscale Control of Quantum States in Radical Molecules on Superconducting Pb(111)

Chao Li, Vladislav Pokorný, Martin Žonda, Jung-Ching Liu, Ping Zhou, Outhmane Chahib, Thilo Glatzel, Robert Häner, Silvio Decurtins, Shi-Xia Liu, Rémy Pawlak, Ernst Meyer
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Abstract

Magnetic impurities on superconductors present a viable platform for building advanced applications in quantum technologies. However, a controlled manipulation of their quantum states continues to pose a significant challenge, hindering the progress in the field. Here we show the manipulation of magnetic states in the radical molecule 4,5,9,10-tetrabromo-1,3,6,8-tetraazapyrene (TBTAP) on a Pb(111) superconducting surface using low-temperature scanning tunneling microscopy. Tunneling spectra reveal Yu-Shiba-Rusinov (YSR) states near the Fermi energy in isolated molecules. A quantum phase transition from singlet to doublet ground state is induced by changing the tip-molecule distance. Additionally, the presence of a second TBTAP molecule allows tuning of the YSR state position by altering the relative distance and can induce splitting of the YSR states for certain orientations. The construction of molecular chains up to pentamers shows periodic arrangements of charged and neutral molecules, with even-numbered chains forming a charged dimer structure at one end. Information can be encoded in these chains by switching the dimer position. These findings elucidate interactions between molecular assemblies and superconducting substrates, paving the way for advanced quantum-state engineering.
超导铅(111)上激元分子量子态的纳米级控制
超导体上的磁性杂质为量子技术的先进应用提供了一个可行的平台。然而,对其量子态的可控操纵仍然是一个重大挑战,阻碍了该领域的进展。在这里,我们展示了利用低温扫描隧道显微镜在铅(111)超导表面上操纵自由基分子 4,5,9,10-四溴-1,3,6,8-四氮杂菲(TBTAP)中的磁态。隧道光谱揭示了孤立分子中接近费米能的 Yu-Shiba-Rusinov (YSR) 态。通过改变针尖-隧道电阻,诱导了从小星态到双基态的量子相变。此外,第二个 TBTAP 分子的存在允许通过改变相对距离来调整 YSR 状态的位置,并能在特定方向上诱导 YSR 状态的分裂。五聚体以下分子链的构建显示出带电分子和中性分子的周期性排列,偶数分子链的一端形成带电的二聚体结构。通过切换二聚体的位置,可以在这些链中编码信息。这些发现阐明了分子组装体与超导基质之间的相互作用,为先进的量子态工程铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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