双层石墨烯
级联
魔法角
材料科学
魔术(望远镜)
石墨烯
凝聚态物理
物理
纳米技术
量子力学
化学
谱线
色谱法
作者
Qianying Hu,Shu Liang,Xinheng Li,Hao Shi,Xi Dai,Yang Xu
出处
期刊:Cornell University - arXiv
日期:2024-06-12
标识
DOI:10.48550/arxiv.2406.08734
摘要
Chern insulators are topologically non-trivial states of matter characterized by incompressible bulk and chiral edge states. Incorporating topological Chern bands with strong electronic correlations provides a versatile playground for studying emergent quantum phenomena. In this study, we resolve the correlated Chern insulators (CCIs) in magic-angle twisted bilayer graphene (MATBG) through Rydberg exciton sensing spectroscopy, and unveil their direct link with the zero-field cascade features in the electronic compressibility. The compressibility minima in the cascade are found to deviate substantially from nearby integer fillings (by $\Delta\nu$) and coincide with the onsets of CCIs in doping densities, yielding a quasi-universal relation $B_c$=$\Phi_0\Delta\nu/C$ (onset magnetic field $B_c$, magnetic flux quantum $\Phi_0$ and Chern number $C$). We suggest these onsets lie on the intersection where the integer filling of localized "f-orbitals" and Chern bands are simultaneously reached. Our findings update the field-dependent phase diagram of MATBG and directly support the topological heavy fermion model.
科研通智能强力驱动
Strongly Powered by AbleSci AI