学术讲座（2024年4月18日10:10）：人工原子-分子杂交体的自旋工程

主持人：姚道新教授

报告摘要：Protecting individual qubits from decoherence and relaxation is one of the crucial challenges for quantum information processing. Both, individual atoms as well as magnetic molecules consisting of one central spin surrounded by ligands, are promising building blocks and offer a route for nanoscale spintronics and future quantum devices. Here, we explore the magnetic properties and spin dynamics of artificially built hybrids of atomic and molecular spins. The resulting magnetic system consisting of an iron phthalocyanine (FePc) molecule coupled to a Fe atom, forms a mixed spin-(1/2,1) quantum ferrimagnet. We show that the strong exchange coupling between two spins leads to a ground-state doublet. Thus, this hybrid behaves effectively like a spin-½ system which is capable of being driven into electron spin resonance by means of scanning tunneling microscopy. Strikingly, the relaxation time of the hybrid is significantly enhanced compared to pristine FePc [1,2] reaching ~1 µs due to the reduction of inelastic spin-flip cross-section as a consequence of the correlation. Moreover, we show by building dimers of hybrids that their spins can be coupled providing a path to realizing larger structures. We believe, that such magnetic prototype structures provide a versatile platform to study complex magnetic interactions and potentially improve spin dynamics on the atomic scale.

个人简介 ：黄万通，2014年毕业于南开大学bet亚洲登录官方网站，获物理学学士学位。2020年毕业于清华大学，获物理学博士学位。2021年－至今，在德国卡尔斯鲁厄理工学院物理系从事博士后研究。博士期间利用稀释制冷扫描隧道显微镜研究TaS2，NbSe2，FeSe等二维材料在极低温强磁场条件下的物性；博后期间参与搭建干式稀释制冷-电子自旋共振-扫描隧道显微镜（ESR-STM），用其研究单个原子，分子及其杂化物的磁性并构造量子比特，旨在提高单量子比特的自旋寿命和相干时间。