The new paradigm of 2D materials as revealed by momentum microscopy

Speaker: Olivier Renault1

Contributors: E. Kloss1, 2, M. Gay1, M. Jamet3

1Univ. Grenoble-Alpes, CEA, LETI, F-38000 Grenoble, 2Univ. Grenoble-Alpes, CNRS, Grenoble INP, Institut Néel, F-38000 Grenoble, 3Univ. Grenoble-Alpes, CEA, IRIG, SPINTEC, F-38000 Grenoble


Two-dimensional (2D) materials beyond graphene such as transition-metal dichalcogenides (TMDC), and related heterostructures, are attracting considerable interest for fundamental research in condensed matter physics due to their intrinsic peculiar properties arising from inversion symmetry breaking. On the applications side, they inherently represent the ultimate level of miniaturization and are promising in optoelectronics due their direct band-gap. Momentum microscopy is very fruitful for retrieving essential data on 2D materials and related heterostructures which need to be studied at the micro-scale with perfect control of the analysis area.

Figure 1: Photoemission electron momentum microscopy (HeI excitation) of a MoSe2/graphene heterostructure.

In this talk, we will review different works using kPEEM performed with a NanoESCA MkI instrument recently upgraded with a micro-focussed He discharge lamp [1-4]. Perspectives regarding correlative momentum microscopy with quantitative core-level mapping using X-rays will be presented.

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[1] Kim, Chen, Renault, Kis et al., Phys. Rev. B 94 (2016) 081401(R); npj 2D Materials & Applications 2 (2018) 2.

[2] Chen, Kim, Renault, Kis et al., ACS Nano 12 (2018) 11161.

[3] Ferrah, Renault, Bouchiat, Cunget et al., ACS Appl. Nano Mater. 2 (2019) 1356.

[4] Dau, Gay, Renault, Jamet et al., ACS Nano 12 (2018) 2319.

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