CIC nanoGUNE-BRTA, 20018 Donostia-San Sebastián, Spain.
School of Physics, Sun Yat-sen University, Guangzhou 510275, China.
Nano Lett. 2022 Aug 10;22(15):6075-6082. doi: 10.1021/acs.nanolett.2c00924. Epub 2022 Jul 27.
Molecular spins on surfaces potentially used in quantum information processing and data storage require long spin excitation lifetimes. Normally, coupling of the molecular spin with the conduction electrons of metallic surfaces causes fast relaxation of spin excitations. However, the presence of superconducting effects in the substrate can protect the excited spin from decaying. In this work, we show that a proximity-induced superconducting gold film can sustain spin excitations of a FeTPP-Cl molecule for more than 80 ns. This long value was determined by studying inelastic spin excitations of the = 5/2 multiplet of FeTPP-Cl on Au films over V(100) using scanning tunneling spectroscopy. The spin lifetime decreases with increasing film thickness, along with the decrease of the effective superconducting gap. Our results elucidate the use of proximitized gold electrodes for addressing quantum spins on surfaces, envisioning new routes for tuning the value of their spin lifetime.
表面上的分子自旋有望用于量子信息处理和数据存储，需要长的自旋激发寿命。通常，分子自旋与金属表面的传导电子的耦合会导致自旋激发的快速弛豫。然而，衬底中超导效应的存在可以保护激发态的自旋不衰减。在这项工作中，我们表明，近邻诱导的超导金膜可以维持 FeTPP-Cl 分子的自旋激发超过 80 ns。通过使用扫描隧道光谱法研究 FeTPP-Cl 的 = 5/2 多重态在 V(100)上的 Au 薄膜上的非弹性自旋激发，确定了这个长的数值。自旋寿命随薄膜厚度的增加而减小，同时有效超导能隙减小。我们的结果阐明了利用近邻化的金电极来寻址表面上的量子自旋，为调节其自旋寿命的数值提供了新的途径。
