Quick identification of ABC trilayer graphene at nanoscale resolution via a near-field optical route  

作　　者：Peiyue Shen Xianliang Zhou Jiajun Chen Aolin Deng Bosai Lyu Zhichun Zhang Shuo Lou Saiqun Ma Binbin Wei Zhiwen Shi 

机构地区：[1]Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education),Shenyang National Laboratory for Materials Science,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,People’s Republic of China [2]Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,People’s Republic of China [3]Institute of System Engineering,Beijing 100191,People’s Republic of China

出　　处：《Materials Futures》2023年第1期158-166,共9页材料展望（英文）

基　　金：supported by the Open Research Fund of Songshan Lake Materials Laboratory(No.2021SLABFK07);the National Key R&D Program of China(No.2021YFA1202902);the National Natural Science Foundation of China(No.12074244);Z S acknowledges support from SJTU(21X010200846);additional support from a Shanghai talent program.

摘　　要：ABC-stacked trilayer graphene has exhibited a variety of correlated phenomena owing to its relatively flat bands and gate-tunable bandgap.However,convenient methods are still lacking for identifying ABC graphene with nanometer-scale resolution.Here we demonstrate that the scanning near-field optical microscope working in ambient conditions can provide quick recognition of ABC trilayer graphene with no ambiguity and excellent resolution(∼20 nm).The recognition is based on the difference in their near-field infrared(IR)responses between the ABA and ABC trilayers.We show that in most frequencies,the response of the ABC trilayer is weaker than the ABA trilayer.However,near the graphene phonon frequency(∼1585 cm−1),ABC’s response increases dramatically when gated and exhibits a narrow and sharp Fano-shape resonant line,whereas the ABA trilayer is largely featherless.Consequently,the IR contrast between ABC and ABA becomes reversed and can even be striking(ABC/ABA∼3)near the graphene phonon frequency.The observed near-field IR features can serve as a golden rule to quickly distinguish ABA and ABC trilayers with no ambiguity,which could largely advance the exploration of correlation physics in ABC-stacked trilayer graphene.

关 键 词：ABC trilayer graphene IDENTIFICATION SNOM NANOSCALE Fano resonance 

分 类 号：TQ127.11[化学工程—无机化工]