Direct Observation of Global Elastic Intervalley Scattering Induced by Impurities on Graphene

被引：13
作者：
Wang, Can [1 ,2 ]
Wang, Huaiqiang [1 ,2 ]
Chen, Wang [1 ]
Xie, Xuedong [1 ]
Zong, Junyu [1 ]
Liu, Lulu [1 ]
Jin, Shaoen [1 ]
Zhang, Yongheng [1 ]
Yu, Fan [1 ]
Meng, Qinghao [1 ]
Tian, Qichao [1 ]
Wang, Li [3 ]
Ren, Wei [3 ]
Li, Fangsen [3 ]
Zhang, Haijun [1 ,2 ]
Zhang, Yi [1 ,2 ]
机构：
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Sch Phys, Nanjing 210093, Peoples R China
[2] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China
[3] Chinese Acad Sci, Suzhou Inst Nanotech & NanoBion SINANO, Vacuum Interconnected Nanotech Workstn Nano X, Suzhou 215123, Peoples R China
来源：
NANO LETTERS | 2021年 / 21卷 / 19期
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
Graphene; ARPES; impurities; intervalley scattering; folded Dirac cone; chirality; STANDING WAVES; INTERFERENCE;
D O I：
10.1021/acs.nanolett.1c02714
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The scattering process induced by impurities in graphene plays a key role in transport properties. Especially, the disorder impurities can drive the ordered state with a hexagonal superlattice on graphene by electron-mediated interaction at a transition temperature. Using angle-resolved photoemission spectroscopy (ARPES), we reveal that the epitaxial monolayer and bilayer graphene with various impurities display global elastic intervalley scattering and quantum interference below the critical temperature (34 K), which leads to a set of new folded Dirac cones at the Brillouin-zone center by mixing two inequivalent Dirac cones. The Dirac electrons generated from intervalley scattering without chirality can be due to the breaking of the sublattice symmetry. In addition, the temperature-dependent ARPES measurements indicate the thermal damping of quantum interference patterns from Dirac electron scattering on impurities. Our results demonstrate that the electron scattering and interference induced by impurities can completely modulate the Dirac bands of graphene.
引用
收藏
页码：8258 / 8265
页数：8
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