腾讯会议：596-932-449，密码：1234
报告摘要：
In transition metal dichalcogenides (TMDs), layers of metals and chalcogens are hold together by weak van der Waals forces creating structural gaps between layers. These gaps can be filled by other elements, enabling the creation and control of unusual electronic and magnetic orders, extending current interest in TMDs well beyond its intrinsic properties. In this talk, we present current results for the intercalation of ZrTe₂ with transition metals and rare-earth elements (MₓZrTe₂, M = Ni, Fe and Dy). In particular, we focus on NiₓZrTe₂. Basic physical properties characterization suggest a charge density order at about T = 285 K. Our ARPES experiments identify an electronic structure resontruction which halves the electronic periodicity along the kz direction. This is reminiscent of a commensurate band folding with wave-vector q = (0,0, Pi). A mean-field model for a charge density wave (CDW) transition driven by interband hole-hole interactions is solved with inputs from the experimentally determined electronic band structure. Moreover, Ni intercalation, as well as Fe and Dy, leads to a superconducting phase for temperatures below T < 5 K. Our ARPES data together with Hc2 measurements, suggest multiband superconductivity. Resolving this gap structure could be the subject of ARPES experiments at lower temperatures.
报告人简介：
Fernando Garcia is an Associate Professor at the University of Sao Paulo, Brazil since 2014. In 2022, he was promoted to the rank of associate professor. Since 2025 he is serving as the deputy head for the department of applied physics, overseeing the department strategic planning for the next 5 years. His PhD is from the State University of Campinas (Unicamp) and had postdoctoral experiences at the Max Planck CPFS (Dresden, Germany), Unicamp and, more recently, at the Ames National Laboratory (Ames, US), during a two-year sabbatical period. Prof. Garcia has experience in condensed matter physics, and is specialized in RIXS and ARPES spectroscopy of correlated materials. His recent work is about Iron-based superconductors, Ce-based Kondo lattices and transition metal dichalcogenides.
邀请人 ：周睿 研究员
联系人：魏佳 secuf_wj@iphy.ac.cn