Ultrafast Switching from the Charge Density Wave Phase to a Metastable Metallic State in 1T-TiSe2

被引:14
|
作者
Duan, Shaofeng [1 ]
Xia, Wei [2 ]
Huang, Chaozhi [1 ]
Wang, Shichong [1 ]
Gu, Lingxiao [1 ]
Liu, Haoran [1 ]
Xiang, Dao [3 ,4 ]
Qian, Dong [1 ,4 ,5 ]
Guo, Yanfeng [2 ]
Zhang, Wentao [1 ,5 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Artificial Struct & Quantum Control, Minist Educ, Shanghai 200240, Peoples R China
[2] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
[3] Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Laser Plasmas, Minist Educ, Shanghai 200240, Peoples R China
[4] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China
[5] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
基金
上海市自然科学基金; 中国国家自然科学基金; 中国博士后科学基金;
关键词
LIGHT-INDUCED SUPERCONDUCTIVITY; SUPERLATTICE FORMATION; ELECTRONIC ORDER; TRANSITION; FERROELECTRICITY; PHOTOEMISSION; CROSSOVER; DYNAMICS;
D O I
10.1103/PhysRevLett.130.226501
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The ultrafast electronic structures of the charge density wave material 1T-TiSe2 were investigated by high-resolution time-and angle-resolved photoemission spectroscopy. We found that the quasiparticle populations drove ultrafast electronic phase transitions in 1T-TiSe2 within 100 fs after photoexcitation, and a metastable metallic state, which was significantly different from the equilibrium normal phase, was evidenced far below the charge density wave transition temperature. Detailed time-and pump-fluence-dependent experiments revealed that the photoinduced metastable metallic state was a result of the halted motion of the atoms through the coherent electron-phonon coupling process, and the lifetime of this state was prolonged to picoseconds with the highest pump fluence used in this study. Ultrafast electronic dynamics were well captured by the time-dependent Ginzburg-Landau model. Our work demonstrates a mechanism for realizing novel electronic states by photoinducing coherent motion of atoms in the lattice.
引用
收藏
页数:7
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