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Regensburg 2022 – scientific programme

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DS: Fachverband Dünne Schichten

DS 20: Poster

DS 20.28: Poster

Wednesday, September 7, 2022, 16:00–18:00, P3

Protection of QSHI indenene from air via intercalation — •Cedric Schmitt1,2, Jonas Erhardt1,2, Simon Moser1,2, and Ralph Claessen1,21Physikalisches Institut, Universität Würzburg, D-97074 Würzburg, Germany — 2Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, D-97074 Würzburg, Germany

In the search for new quantum materials, ultrathin metals are interesting as they push bulk properties to the 2D limit and foster novel quantum effects. Unfortunately, these systems are prone to oxidation in air, making them useless for quantum transport devices. Metal intercalation is a relatively new capping method, that utilizes graphene, an inert quantum material that can be easily produced by heating of a SiC substrate [1,2]. Hereby, the metal is intercalated between the SiC/graphene layer, thus forming freestanding graphene, which is believed to protect the intercalated layers against oxidation [3]. Hitherto studies focused mainly on identifying stable allotropes but lacking a detailed investigation of metal coverage and oxidation [3]. Here, we study the intercalation of indenene, a recently discovered QSHI on a triangular lattice [4]. First experiments indicate the indium layer to remain intact upon air exposure, indeed pointing to an effective protective function of the overlayer graphene.
[1] K. S. Novoselov et. al. Science 306, 666 (2004)

[2] C. Berger et. al. J. Phys. Chem. B 108, 19912 (2004)

[3] N. Briggs et al. Nat. Mater. 19, 637-643 (2020)

[4] M. Bauernfeind et al. Nat. Commun. 12, 5396 (2021)

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