Revealing Light-Induced Charge Density Wave Melting and Carrier Redistribution in 1T-TiSe_(2)  

作　　者：Wanying Chen Haoyuan Zhong Changhua Bao Fei Wang Xuanxi Cai Chenxia Yun Hao Teng Zhiyi Wei Shuyun Zhou 陈婉莹;钟浩源;鲍昌华;王飞;蔡轩羲;运晨霞;滕浩;魏志义;周树云(State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics,Tsinghua University,Beijing 100084,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Frontier Science Center for Quantum Information,Beijing 100084,China)

机构地区：[1]State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics,Tsinghua University,Beijing 100084,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]Frontier Science Center for Quantum Information,Beijing 100084,China

出　　处：《Chinese Physics Letters》2025年第1期123-133,共11页中国物理快报(英文版)

基　　金：supported by the Synergetic Extreme-Condition User Facility(SECUF);the National Key R&D Program of China(Grant Nos.2021YFA1400100,2020YFA0308800,and 2022YFA1604200);the National Natural Science Foundation of China(Grant Nos.12234011,92250305,52388201,11725418,and 11427903);supported by the China Postdoctoral Science Foundation(Grant Nos.2022M721886 and BX20230187);the Shuimu Tsinghua Scholar Program。

摘　　要：Capturing ultrafast dynamics over a large momentum space is critical for revealing the relationship between the electronic and structural modulations in quantum materials.Here,by performing time-and angle-resolved photoemission spectroscopy measurements at the Synergetic Extreme Condition User Facility(SECUF)equipped with an extreme ultraviolet light source,we reveal the ultrafast dynamics of a charge-density wave(CDW)material,1T-TiSe_(2),upon photoexcitation.Pump-induced CDW melting is revealed from two aspects:gap closing of the CDW at the Brillouin zone(BZ)center and weakening of the CDW folded band at the BZ boundary.By comparing the transient electronic structure and spectral weight over a large momentum space,we further reveal the carrier redistribution involving the excitation of electrons from theГpoint to the M point.This study provides a comprehensive picture of the physics and ultrafast dynamics of a CDW material across the entire BZ.

关 键 词：MOMENTUM equipped distribution 

分 类 号：TN2[电子电信—物理电子学]