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Quasicrystalline surfaces and their use as templates for the growth of 2D artificial quasicrystals - Vincent Fournée

Université de Lorraine, Nancy


LPS bat 510 – amphi Moyen

Quasiperiodic structures exhibit long-range order like normal crystals but lack translational symmetry. Quasicrystals were first discovered as a new class of intermetallic compounds [1], now comprising hundreds of members in binary and ternary systems. They usually adopt either the icosahedral or the decagonal point group symmetry. Latter, quasicrystals were also found in soft matter systems [2] and more recently in a two-dimensional perovskite oxide thin film grown on a periodic substrate [3].

The discovery of quasicrystals has led to a paradigm shift in crystallography and has attracted a large interest in the material science community, motivated by unexpected physical properties that could be linked to quasiperiodicity. This remarkable class of materials has also challenged our understanding of metal surfaces. An atomic scale description of their surfaces is especially important, as it forms the basis for understanding and predicting phenomena such as gas adsorption, metal epitaxy, and friction. Here we will review how the quasicrystal surface structure can be related to the bulk structure and what is the nature of the planes terminating their surface ([4]). We will also review some of their characteristics, and how these surfaces can be used as templates to grow artificial 2D quasiperiodic metallic or molecular thin films.

[1] D. Shechtman, I. Blech, D. Gratias, J. Cahn, Phys. Rev. Lett. 53, (1984) 1951–1953.
[2] X. Zeng, G. Ungar et al., Nature, 428, (2004) 157.
[3] S. Förster, K. Meinel, R. Hammer, M. Trautmann, W. Widdra, Nature, 502, (2013) 215.
[4] J. Ledieu, V. Fournée, C. R. Physique , 15, (2014) 48–57.
[5] V. Fournée et al., ACS Nano, 8 (2014) 3646. N. Kalashnyk et al., Nano Research, 11(4) (2018) 2129.

Agenda

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