Pressure effects on the lattice vibrations and ultrafast photocarrier dynamics in 2H-TaS2
文献类型：期刊论文
| 作者 | Zhang, Kai1; Jiang, Huachao1 ; Yang, Jin1; Zhang, Jie1; Zeng, Zhi1; Chen, Xiaojia1,2; Su, Fuhai1
|
| 刊名 | APPLIED PHYSICS LETTERS
 |
| 出版日期 | 2020-09-08 |
| 卷号 | 117 |
| ISSN号 | 0003-6951 |
| DOI | 10.1063/5.0018615 |
| 通讯作者 | Su, Fuhai(fhsu@issp.ac.cn) |
| 英文摘要 | Vibrational properties and ultrafast photocarrier dynamics of 2H-TaS2 under pressures are studied by the experiments of Raman scattering and femtosecond time resolved spectroscopy. With increasing pressure, the linewidth of two-phonon Raman mode broadens, especially features with a sudden rapid increase above 10GPa. Meanwhile, the ultrafast dynamics show that the fast decay through optical phonon scattering is significantly suppressed in amplitude and prolonged in lifetime; however, the weight of the slow decay component originating from acoustic phonon scattering is enhanced at high pressures. Furthermore, the electron-phonon (e-ph) coupling constant, lambda (q), and the density of states (DOS) near the Fermi level, N(0), are evaluated qualitatively, which reveals a drastic decrease in e-ph coupling strength and a sudden increase in the DOS beyond 10GPa. This turning pressure is consistent with the critical point where T c of superconductivity peaks while the charge density wave (CDW) vanishes, indicating the direct correlations between lambda (q), N(0), superconductivity, and the CDW under pressure. The anomaly of the DOS may imply the occurrence of a topological transition of the electronic structure. Our work not only provides valuable information for the understanding of competition between the CDW and superconductivity in 2H-TaS2 but also may open up a routine to unveil the pressure-induced electronic topological transition. |
| WOS关键词 | RAMAN-SCATTERING ; PHONON DYNAMICS ; TRANSITION ; ELECTRON ; TEMPERATURE ; RELAXATION ; METAL |
| 资助项目 | National Natural Science Foundation of China[11774354] ; National Natural Science Foundation of China[51672279] ; National Natural Science Foundation of China[51727806] ; National Natural Science Foundation of China[11874361] ; Science Challenge Project[TZ2016001] ; CAS Innovation Grant[CXJJ-19-B08] ; CASHIPS Director's Fund[YZJJ201705] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000571938500002 |
| 出版者 | AMER INST PHYSICS |
| 资助机构 | National Natural Science Foundation of China ; Science Challenge Project ; CAS Innovation Grant ; CASHIPS Director's Fund |
| 源URL | [http://ir.hfcas.ac.cn:8080/handle/334002/104238]  |
| 专题 | 中国科学院合肥物质科学研究院 |
| 通讯作者 | Su, Fuhai |
| 作者单位 | 1.Chinese Acad Sci, HFIPS, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China 2.Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Kai,Jiang, Huachao,Yang, Jin,et al. Pressure effects on the lattice vibrations and ultrafast photocarrier dynamics in 2H-TaS2[J]. APPLIED PHYSICS LETTERS,2020,117. |
| APA | Zhang, Kai.,Jiang, Huachao.,Yang, Jin.,Zhang, Jie.,Zeng, Zhi.,...&Su, Fuhai.(2020).Pressure effects on the lattice vibrations and ultrafast photocarrier dynamics in 2H-TaS2.APPLIED PHYSICS LETTERS,117. |
| MLA | Zhang, Kai,et al."Pressure effects on the lattice vibrations and ultrafast photocarrier dynamics in 2H-TaS2".APPLIED PHYSICS LETTERS 117(2020). |
入库方式： OAI收割
来源：合肥物质科学研究院
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