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A Novel, Synthetic, 2D Silicon Allotrope: Single and Multi-Layer Silicene

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  • Visitor Seminars
When Jul 26, 2013
from 11:00 AM to 12:00 PM
Where Engr. IV Bldg., Tesla Room 53-125
Contact Name
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A Novel, Synthetic, 2D Silicon Allotrope: Single and Multi-Layer Silicene


Guy Le Lay

Aix-Marseille University, Marseille, France & CNR-ISM, Rome, Italy



Silicene, a novel two-dimensional silicon allotrope with a honeycomb, graphene-like, atomic structure, has been recently synthesized, generating considerable interest, since its topology gives birth to the same remarkable electronic properties as those of graphene1. Furthermore, silicene has the potential advantage of being more easily integrated in current Si-based nano/micro-electronics. In this seminar, I will present the epitaxial formation of single and multi-layer silicene on Ag substrates and discuss their structural and electronic properties. I will further look at the prospects of silicene growth on semiconducting or insulating substrates.

1) P. Vogt et al., Phys. Rev. Lett. 108, 55501 (2012); C.-L. Lin et al., Appl. Phys. Exp. 5, 045802 (2012); A. Fleurence et al., Phys. Rev. Lett. 108, 245501 (2012); B. Feng et al., Nano Lett. 12, 3507 (2012); Z. Ni et al., Nano Lett. 12, 113 (2012); J. Gao, J. Zhao, Sci. Rep. 2, 111 (2012).


Dr. Le Lay is a full professor of Physics, at Aix-Marseille University, France. For many years he has been a member of the Comité National des Universités and was for five years President of the regional section of the French Physical Society. After education as a Mining Engineer (1968), he started research in Solid State Physics, in Nancy (France). Soon after, he moved to Marseille where he engaged in Surface Science, then a new discipline. There, he got two Doctoral degrees in Physics in 1972 and 1978 for his pioneering work on the formation of metal/semiconductor interfaces. With his team, he continued to work on well-controlled low-dimensional systems: surfaces, interfaces and nanostructures using Nanoscience tools in synergy with advanced structural and spectroscopy methods at several synchrotron radiation facilities. He has also studied crystal growth in space; he was co-PI of the Mercuric Iodide Crystal Growth experiment that flew on board Discovery, in 1992.

Prof. Le Lay has been a member of the French Comité de Physique and in 1985 he launched the 1st International Conference on the Formation of Semiconductor Interfaces. He, an expert in Synchrotron Radiation, served for eight years as a member of the European Round Table on Synchrotron Radiation and Free Electron Lasers. During his term, he has chaired and organized numerous International Schools, Workshops and Conferences and served on many UNESCO, NATO, EC, international, national and regional panels and expert committees.

Currently, Prof. Le Lay is working on two-dimensional materials beyond graphene, especially silicene, which he discovered with his team in Marseille and published in a seminal paper in 2012. Prof. Le Lay is also involved in some art-science collaborative projects that have been performed and exhibited, especially during the Einstein International Year of Physics, in 2005.

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