报告题目：Rich phase diagram of layered iridates upon artificial engineering

报告人：郝林，中国科学院合肥物质科学研究院强磁场中心研究员

报告时间：2022年9月15日上午12：00

腾讯会议：283 558 136

报告摘要

While manipulation of antiferromagnetic (AFM) order arises to the forefront of spintronics, it is a long-standing fundamental problem of correlated electron physics. In this talk, I will present couple exciting findings in the strong spin-orbit coupled correlated system, layered iridates. A series of artificial layered iridates [(SrIrO₃)₁/(SrTiO₃)_m] were prepared to engage with a staggered magnetic field effect due to the strong spin-orbit interaction. By tuning the SrTiO₃ spacer, the AFM structure of the Mott insulating state can be engineered. Upon driving the AFM structure to the two-dimensional limit at m = 2, a hidden SU(2) symmetry is achieved, which was first proposed in cuprates but never experimentally realized. As a result, while the ordering temperature is significantly reduced by strong critical fluctuations, the staggered magnetic field effect allows an external field to greatly suppress the AFM fluctuations and enable a giant response of the AFM order. With a partially released charge degree of freedom at m = 1, the staggered magnetic field effect leads to an intriguing positive anomalous magnetoresistance that probes the AFM susceptibility, because of the strong interplay between charge and longitudinal spin fluctuations. After introducing a gauge-invariant spin-dependent hopping on the square lattice, an exceptionally large magnon gap and an interesting anomalous Hall effect were obtained, highlighting the intriguing correlation-topology interplay in the intermediate regime.

报告人简介

　　郝林，中国科学院合肥物质科学研究院强磁场中心研究员。2016 年博士毕业于中国科学技术大学物理系，2016 年-2020 年在美国田纳西大学从事博士后训练，2020 年起任职于中国科学院合肥物质科学研究院。长期从事过渡金属氧化物等复杂体系的演生效应研究，近年来利用原子级精准制备、同步辐射等技术对铱氧化物四方晶格体系中的磁电输运、低维磁性等现象开展了系统研究。目前已以第一/通讯作者身份在 Nature Physics、Physical Review X、Physical Review Letters、Nature Communications等高水平国际学术期刊发表论文二十余篇。2021年获得国家自然科学基金优秀青年科学基金项目（海外）资助。

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