Carrier and Polarization Dynamics in Monolayer MoS2
文献类型：期刊论文
| 作者 | Lagarde, D ; Bouet, L ; Marie, X ; Zhu, CR ; Liu, BL ; Amand, T ; Tan, PH ; Urbaszek, B |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2014 |
| 卷号 | 112期号:4 |
| ISSN号 | 0031-9007 |
| 通讯作者 | Lagarde, D (reprint author), Univ Toulouse, INSA CNRS UPS, LPCNO, 135 Ave Rangueil, F-31077 Toulouse, France. |
| 中文摘要 | In monolayer MoS2, optical transitions across the direct band gap are governed by chiral selection rules, allowing optical valley initialization. In time-resolved photoluminescence (PL) experiments, we find that both the polarization and emission dynamics do not change from 4 to 300 K within our time resolution. We measure a high polarization and show that under pulsed excitation the emission polarization significantly decreases with increasing laser power. We find a fast exciton emission decay time on the order of 4 ps. The absence of a clear PL polarization decay within our time resolution suggests that the initially injected polarization dominates the steady-state PL polarization. The observed decrease of the initial polarization with increasing pump photon energy hints at a possible ultrafast intervalley relaxation beyond the experimental ps time resolution. By compensating the temperature-induced change in band gap energy with the excitation laser energy, an emission polarization of 40% is recovered at 300 K, close to the maximum emission polarization for this sample at 4 K. |
| 资助信息 | ERC [306719]; Programme Investissements d'Avenir [ANR-11-IDEX-0002-02, ANR-10-LABX-0037-NEXT]; CAS [2011T1J37]; National Basic Research Program of China [2009CB930502, 2009CB929301]; National Science Foundation of China [11174338, 11225421, 10934007, 10911130356] |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/59593]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Lagarde, D,Bouet, L,Marie, X,et al. Carrier and Polarization Dynamics in Monolayer MoS2[J]. PHYSICAL REVIEW LETTERS,2014,112(4). |
| APA | Lagarde, D.,Bouet, L.,Marie, X.,Zhu, CR.,Liu, BL.,...&Urbaszek, B.(2014).Carrier and Polarization Dynamics in Monolayer MoS2.PHYSICAL REVIEW LETTERS,112(4). |
| MLA | Lagarde, D,et al."Carrier and Polarization Dynamics in Monolayer MoS2".PHYSICAL REVIEW LETTERS 112.4(2014). |
入库方式： OAI收割
来源：物理研究所
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