[MOS] 4/25: Modern Optics and Spectroscopy seminar with Ricardo Pablo Pedro (MIT)

[Christine Brooks]

Please join us for a Modern Optics and Spectroscopy seminar next Tuesday, April 25, with Ricardo Pablo Pedro of MIT. The seminar will be held in MIT 34-401 at 12pm, with refreshments served immediately afterward.

Ricardo Pablo Pedro
Massachusetts Institute of Technology

Electronic Study of Rectangular Silicene Nanoclusters

In the last years, graphene has attracted an increasing interest because it is considered the elementary unit in modern microelectronics such as field-effect transistors, photovoltaics cells, advanced sensors, and even battery energy storage.  As in graphene, the valence and conduction bands of silicene meet at two inequivalent Dirac points (K and K’ points) at the Fermi level. This peculiar band structure gives rise to its exceptionally high electrical and thermal conductivities, and also to many other interesting properties. However, even though there is already conclusive experimental evidence for silicene formation upon different types of substrates, the inherent difficulty of its synthesis has imposed constraints in obtaining free-standing silicene in the laboratory and in understanding the influences of doping, external fields, defects, and magnetic moments on the properties of this material, thereby limiting silicenes’s exploitation in nanoelectronics and high-efficiency thermoelectric materials. Therefore, we investigate the electronic and transport properties of silicene nanclusters. Using the calculated Raman Spectra, we attempted to understand the electronic character of rectangular silicene nanoclusters along the zigzag (nz) and armchair (na) directions. Then, we demonstrate that silicene nanoclusters can exhibit a ferromagnetic state  for na > nz with na and nz being the units on the armchair and zigzag edges of the rectangular nanoclusters, respectively. Additionally, the study of the band gap and its tunability as a function of the rectangular nanocluster length could make silicene a good candidate for future nanotechnology applications.


Christine Brooks
Administrative Assistant
Massachusetts Institute of Technology
Department of Chemistry
77 Massachusetts Ave, 6-333
Cambridge, MA 02139
p: 617.253.7239
e: cbrooks at mit.edu

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