Abstract
Electronic structure describes the distribution of electronic states in reciprocal space, being one of the most fundamental concepts in condensed matter physics, since it determines the electrical, optical and magnetic behaviours of materials. Due to its two-dimensional honeycomb lattice with covalent bonding, pristine graphene exhibits unsurpassed in-plane stiffness and stable structural properties. Here by employing angle-resolved photoemission spectroscopy with spatial resolution ∼ 100 nm (Nano-ARPES), we discuss in detail the structural and electronic properties of graphene grown on cooper by chemical vapour deposition (CVD). Our results reveal the spatial inhomogeneity of graphene film, demonstrating the power of Nano-ARPES to detect the microscopic inhomogeneity of electronic structure for different materials.
Highlights
Despite its rapid exploration and application, graphene overlayers on metal surfaces still present various phenomena which are far away from the being completely understood[1, 2, 3]
High resolution angle-resolved photoemission spectroscopy (ARPES) has been well established as a powerful technique to probe distinctly the electronic structure of complex materials[6, 7], conventional ARPES has its limitation to describe the impact of the polycrystalline nature on the low energy quasiparticle behaviour of graphene films on copper foils[8, 9]
We employ the first ARPES facility with spatial resolution down to submicrometer scale (Nano-ARPES or k-microscope)[10, 11] to study the graphene grown on Cu
Summary
Despite its rapid exploration and application, graphene overlayers on metal surfaces still present various phenomena which are far away from the being completely understood[1, 2, 3]. High resolution angle-resolved photoemission spectroscopy (ARPES) has been well established as a powerful technique to probe distinctly the electronic structure of complex materials[6, 7], conventional ARPES has its limitation to describe the impact of the polycrystalline nature on the low energy quasiparticle behaviour of graphene films on copper foils[8, 9]. The spectra intensity distribution image of graphene upper Dirac cone was generated by integrating the corresponding energy-angle window and scan the sample along two in-plane axises.
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