Above-Curie-temperature ultrafast terahertz emission and spin current generation in a 2D superlattice(Fe_(3)GeTe_(2)/CrSb)_(3)  

作　　者：Peiyan Li Na Wu Shanshan Liu Yu Cheng Piming Gong Junwei Tong Jianan Liu Wei He Faxian Xiu Jimin Zhao Sheng Meng Xiaojun Wu 

机构地区：[1]Hangzhou International Innovation Institute,Beihang University,Hangzhou 311115,China [2]School of Electronic and Information Engineering,Beihang University,Beijing 100191,China [3]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [5]State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China [6]Department of Physics,Freie Universität Berlin,Berlin 14195,Germany [7]Songshan Lake Materials Laboratory,Dongguan 523808,China [8]Zhangjiang Laboratory,Shanghai 201210,China [9]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《National Science Review》2025年第3期392-400,共9页国家科学评论(英文版)

基　　金：supported by the National Natural Science Foundation of China(U23A6002,92250307,12025407,92250303,12174427 and 52350001);the National Key Research and Development Program of China(2022YFA1604402 and 2021YFA1400201);the CAS Project for Young Scientists in Basic Research(YSBR-059 and YSBR-047);the Open Project Program of Wuhan National Laboratory for Optoelectronics(2022WNLOKF006);the Shanghai Municipal Science and Technology Major Project(2019SHZDZX01);the Shanghai Pilot Program for Basic Research Fudan University 21TQ1400100(21TQ006).

摘　　要：The increasing demand for denser information storage and faster data processing has fueled a keen interest in exploring spin currents up to terahertz(THz)frequencies.Emergent 2D intrinsic magnetic materials constitute a novel and highly controllable platform to access such femtosecond spin dynamics at atomic layer thickness.However,the function of 2D van der Waals magnets are limited by their Curie temperatures,which are usually low.Here,in a 2D superlattice(Fe_(3)GeTe_(2)/CrSb)_(3),we demonstrate ultrafast laser-induced spin current generation and THz radiation at room temperature,overcoming the challenge of the Curie temperature of Fe_(3)GeTe_(2)being only 206 K.In tandem with time-resolved magneto-optical Kerr effect measurements and first-principles calculations,we further elucidate the origin of the spin currents-a laser-enhanced proximity effect manifested as a laser-induced reduction of interlayer distance and enhanced electron exchange interactions,which causes transient spin polarization in the heterostructure.Our findings present an innovative,magnetic-element-free route for generating ultrafast spin currents within the 2D limit,underscoring the significant potential of laser THz emission spectroscopy in investigating laser-induced extraordinary spin dynamics.

关 键 词：ultrafast terahertz spin current 2D superlattice(Fe_(3)GeTe_(2)/CrSb)_(3) laser-enhanced proximity effect above Curie temperature 

分 类 号：O469[理学—凝聚态物理]