期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE RESEARCH
DOI: 10.1038/s41467-020-14472-0
关键词
-
资金
- Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-SC0018171]
- DoE BES [DE-SC0014349]
- Army Research Office (ARO) Multidisciplinary University Research Initiative (MURI) program [W911NF-18-1-0431]
- NSF MRSEC [1719797]
- Research Grants Council of Hong Kong [17312916]
- Seed Funding for Strategic Interdisciplinary Research Scheme of HKU
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division
- Elemental Strategy Initiative by the MEXT, Japan
- CREST, JST [JPMJCR15F3]
- State of Washington
- Boeing Distinguished Professorship in Physics
- U.S. Department of Energy (DOE) [DE-SC0014349] Funding Source: U.S. Department of Energy (DOE)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1719797] Funding Source: National Science Foundation
The coupling between spin, charge, and lattice degrees of freedom plays an important role in a wide range of fundamental phenomena. Monolayer semiconducting transitional metal dichalcogenides have emerged as an outstanding platform for studying these coupling effects. Here, we report the observation of multiple valley phonons - phonons with momentum vectors pointing to the corners of the hexagonal Brillouin zone - and the resulting exciton complexes in the monolayer semiconductor WSe2. We find that these valley phonons lead to efficient intervalley scattering of quasi particles in both exciton formation and relaxation. This leads to a series of photoluminescence peaks as valley phonon replicas of dark trions. Using identified valley phonons, we also uncover an intervalley exciton near charge neutrality. Our work not only identifies a number of previously unknown 2D excitonic species, but also shows that monolayer WSe2 is a prime candidate for studying interactions between spin, pseudospin, and zone-edge phonons. In monolayer semiconductors phonons with momentum vectors pointing to the corners of the hexagonal Brillouin zone couple strongly to carriers' spin and valley degree of freedom. Here, the authors report the observation of multiple valley phonons and the resulting exciton complexes in the monolayer semiconductor WSe2.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据