Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1126/science.aam9175 |
Tunable excitons in bilayer graphene | |
Ju, Long1,2; Wang, Lei1,2; Cao, Ting3; Taniguchi, Takashi4; Watanabe, Kenji4; Louie, Steven G.3,5; Rana, Farhan6; Park, Jiwoong1,7; Hone, James8; Wang, Feng3,5,9,10; McEuen, Paul L.1,2 | |
2017-11-17 | |
发表期刊 | SCIENCE |
ISSN | 0036-8075 |
EISSN | 1095-9203 |
出版年 | 2017 |
卷号 | 358期号:6365页码:907-910 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Japan |
英文摘要 | Excitons, the bound states of an electron and a hole in a solid material, play a key role in the optical properties of insulators and semiconductors. Here, we report the observation of excitons in bilayer graphene (BLG) using photocurrent spectroscopy of high-quality BLG encapsulated in hexagonal boron nitride. We observed two prominent excitonic resonances with narrow line widths that are tunable from the mid-infrared to the terahertz range. These excitons obey optical selection rules distinct from those in conventional semiconductors and feature an electron pseudospin winding number of 2. An external magnetic field induces a large splitting of the valley excitons, corresponding to a g-factor of about 20. These findings open up opportunities to explore exciton physics with pseudospin texture in electrically tunable graphene systems. |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000415293000042 |
WOS关键词 | PHOTOCURRENT SPECTROSCOPY ; MONOLAYER WSE2 ; QUANTUM-WELLS ; SEMICONDUCTORS ; EXCITATIONS ; ABSORPTION ; SPECTRA ; PHASE |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/197355 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Cornell Nanoscale Sci, Kavli Inst, Ithaca, NY 14853 USA; 2.Cornell Univ, Lab Atom & Solid State Phys, Ithaca, NY 14853 USA; 3.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA; 4.Natl Inst Mat Sci, 1-1 Namiki, Tsukuba, Ibaraki 3050044, Japan; 5.Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA; 6.Cornell Univ, Sch Elect & Comp Engn, Ithaca, NY 14853 USA; 7.Cornell Univ, Dept Chem & Chem Biol, Ithaca, NY 14853 USA; 8.Columbia Univ, Dept Mech Engn, New York, NY 10027 USA; 9.Univ Calif Berkeley, Kavli Energy NanoSci Inst, Berkeley, CA 94720 USA; 10.Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA |
推荐引用方式 GB/T 7714 | Ju, Long,Wang, Lei,Cao, Ting,et al. Tunable excitons in bilayer graphene[J]. SCIENCE,2017,358(6365):907-910. |
APA | Ju, Long.,Wang, Lei.,Cao, Ting.,Taniguchi, Takashi.,Watanabe, Kenji.,...&McEuen, Paul L..(2017).Tunable excitons in bilayer graphene.SCIENCE,358(6365),907-910. |
MLA | Ju, Long,et al."Tunable excitons in bilayer graphene".SCIENCE 358.6365(2017):907-910. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论