Laboratory-based real and reciprocal space imaging of the electronic structure of few layer graphene on SiC(0001¯) using photoelectron emission microscopy

N. Barrett 1 K. Winkler 2 B. Krömker E.H. Conrad 3
1 LENSIS - Laboratoire d'Etude des NanoStructures et Imagerie de Surface
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
2 IPP - Max-Planck-Institut für Plasmaphysik [Garching]
3 School of Physics, The Georgia Institute of Technology
Abstract : We present real and reciprocal space photoelectron emission microscopy (PEEM) results on few layer graphene using laboratory based He I and II radiation. The combination of a focused high-intensity source and high transmission PEEM electron optics provides good signal to noise ratios for the different modes of acquisition. We demonstrate work function mapping and secondary electron analysis, related to the graphene layer thickness, band structure imaging from micron scale regions by wave vector resolved PEEM (k-PEEM) and local secondary electron spectroscopy, giving information on the valence and conduction band states and the dispersion relations of the π bands. Dark field PEEM is done by selecting the Dirac cone corresponding to the specific rotation of each graphene layer and allows spatial mapping of the commensurate rotation angles. The use of He II radiation increases the volume of reciprocal space accessible to k-PEEM and improves signal to background. The preferential linear polarization of the light source is used to investigate aspects of the electronic chirality near the Dirac cone. Recent developments in sample manipulation and cooling are presented.
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Article dans une revue
Ultramicroscopy, Elsevier, 2013, 130, pp.94 - 100. 〈10.1016/j.ultramic.2013.02.010〉
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https://hal-cea.archives-ouvertes.fr/cea-01477574
Contributeur : Dominique Girard <>
Soumis le : lundi 27 février 2017 - 14:56:36
Dernière modification le : vendredi 16 mars 2018 - 01:14:16

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CEA | DSM-IRAMIS | IRAMIS-SPEC | CEA-DRF

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N. Barrett, K. Winkler, B. Krömker, E.H. Conrad. Laboratory-based real and reciprocal space imaging of the electronic structure of few layer graphene on SiC(0001¯) using photoelectron emission microscopy. Ultramicroscopy, Elsevier, 2013, 130, pp.94 - 100. 〈10.1016/j.ultramic.2013.02.010〉. 〈cea-01477574〉

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