学术预告|广东省磁电物性分析与器件重点实验室学术讲座(第二十六期)：人工原子-分子杂交体的自旋工程

报告人:黄万通 博士（德国卡尔斯鲁厄理工学院）

题目：人工原子-分子杂交体的自旋工程

地点：beat365中国唯一官方网站南校园550栋二楼报告厅

时间：2024年4月18日（星期四）上午10:10

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.

黄万通，2014年毕业于南开大学beat365中国唯一官方网站，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。