期刊
SCIENCE ADVANCES
卷 5, 期 9, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aaw9770
关键词
-
资金
- DOE BES Division [ER 46940-DE-SC0010597]
- Center for Emergent Materials: an NSF MRSEC [DMR-1420451]
- Army Research Office [W911NF-18-1-0416]
- Elemental Strategy Initiative
- JSPS
The emergence of flat bands and correlated behaviors in magic angle twisted bilayer graphene (tBLG) has sparked tremendous interest, though its many aspects are under intense debate. Here we report observation of both superconductivity and the Mott-like insulating state in a tBLG device with a twist angle of similar to 0.93 degrees, which is smaller than the magic angle by 15%. At an electron concentration of +/- 5 electrons/moire unit cell, we observe a narrow resistance peak with an activation energy gap similar to 0.1 meV. This indicates additional correlated insulating state, and is consistent with theory predicting a high-energy flat band. At doping of +/- 12 electrons/moire unit cell we observe resistance peaks arising from the Dirac points in the spectrum. Our results reveal that the magic range of tBLG is in fact larger than what is previously expected, and provide a wealth of new information to help decipher the strongly correlated phenomena observed in tBLG.
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