Stacking-Dependent Electronic Structure of Trilayer Graphene Resolved by Nanospot Angle-Resolved Photoemission Spectroscopy

• DOI: 10.1021/acs.nanolett.6b04698
• Publication Date: 2017-02-22T05:49:01Z
• Authors: Changhua Bao; Wei Yao; Eryin Wang; Chaoyu Chen; José Avila; Maria C. Asensio; Shuyun Zhou
• Keywords: Condensed Matter - Materials Science; 0103 physical sciences; Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; 01 natural sciences

The crystallographic stacking order in multilayer graphene plays an important role determining its electronic structure. In trilayer graphene, rhombohedral (ABC) is particularly intriguing, exhibiting a flat band with electric-field tunable gap. Such structure distinct from simple hexagonal (AAA) or typical Bernal (ABA) and promising for nanoscale electronics optoelectronics applications. So far clean experimental spectra on the first two stackings are missing because samples usually too small size (μm nm scale) to be resolved by conventional angle-resolved photoemission spectroscopy (ARPES). Here, using ARPES nanospot beam (NanoARPES), we provide direct evidence coexistence of three different reveal their distinctive structures directly. By fitting data, parameters describing stackings.