University of Ljubljana, Slovenia

报告人简介：

Andrej Zorko received his PhD degree in Physics in 2004 from the University of Ljubljana, Slovenia, where he currently holds a position of full professor in Physics. He is also a scientific councilor at the Jožef Stefan Institute, Ljubljana, Slovenia, where he is the head of Laboratory for measurements at large-scale user facilities. In 2007-2008 he was a postdoctoral Marie-Curie Fellow at the Laboratoire de Physique des Solides, Université Paris-Saclay, France and in 2024 he was a visiting professor at the Hokkaido Summer Institute, Hokkaido University, Japan. He is a member of various international boards and panels, from 2022 he is a Vice President of the International Society for muSR Spectroscopy. His main research interest is quantum magnetism. Within his experimental group they focus on novel quantum materials by employing various local-probe magnetic techniques and neutron scattering. He is a recipient of several national and international awards, including the 2023 APS Robert E. Marshak Lectureship Award by the American Physical Society and the 2022 Science Impact Award by the Science and Technology Facilities Council, UK.

报告摘要：

Quantum magnets are at the forefront of contemporary condensed mater physics due to a plethora of fundamental quantum phenomena they exhibit, as well as due to their vast potential in quantum technologies. They display many exotic phases driven by strong quantum fluctuations that prevent conventional magnetic ordering. Among these phases, quantum spin liquids characterized by long-range quantum entanglement and fractionalized excitations represent a unique state of matter. Recently, it has been shown theoretically and experimentally how such states can further transform into spin supersolids, where magnetic order coexists with superfluid-like properties. I will present our recent discoveries in the intriguing family of rare-earth (RE) heplatantalates RETa7O19, featuring a geometrically frustrated triangular spin lattice. In the neodymium-based member, a QSL ground state characterized by Ising-like spin correlations and persistent spin dynamic is found, while in the erbium-based member an intrinsically unstable spin supersolid state is realized. I will also highlight the most appropriate experimental tools to detect and characterize these unconventional states.

邀请人：张清明（qmzhang@iphy.ac.cn）

联系人：胡颖（8264 9361）

报告地点：中国科学院物理研究所M楼236会议室