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O: Fachverband Oberflächenphysik

O 62: Graphene: Electronic structure, excitations, etc. (joint session O/TT)

O 62.11: Vortrag

Mittwoch, 11. März 2026, 17:30–17:45, HSZ/0204

NanoARPES Facility in Shanghai Synchrotron Radiation Facility and Investigation of the Moiré bands in Graphene Devices — •Zhongkai Liu — Shanghaitech University

Spatially resolved angle-resolved photoemission spectroscopy (NanoARPES) is an indispensable tool for probing the electronic structure of exfoliated sample flakes, fabricated devices, and more. In this presentation, we describe the construction, specifications, capabilities, and operation of BL07U-the NanoARPES endstation at the Shanghai Synchrotron Radiation Facility (SSRF) [1]. We will showcase our research on the electronic structure of emerging graphene devices, with a focus on moiré and flat bands. For example, our ARPES studies on magic-angle twisted trilayer graphene clearly reveal the coexistence of moiré flat bands and Dirac bands [2]. In aligned bilayer graphene/hBN heterostructures, we demonstrate that in-situ back gating enables precise tuning of the moiré electronic structure [3]. We directly observe the characteristic topological electronic structures of rhombohedral multilayer graphene, from a 3D generalization of the 1D Su-Schrieffer-Heeger (SSH) chain in thin layers to a topological Dirac nodal spiral semimetal in bulk rhombohedral graphite [4]. Finally, we present our work on the moiré band in bulk alternating twist graphene, which becomes flat at "magic momenta".

Reference: [1] H. Gao et al., Synchrotron Radiation News 37, 12-17 (2024) [2] Y. W. Li et al., Advanced Materials 202205996 (2022) [3] H. B. Xiao et al., Advanced Science 202412609 (2025) [4] H. B. Xiao et al., Science Bulletin 70, 1030-1033 (2025)

Keywords: NanoARPES; Moire bandstructure; alternating twist graphene