Shape dependent magnetic and optical properties in silicene nanodisks: A first principles study

We report the optical anisotropy of four differently shaped silicene nanodisks within the framework of density functional theory in the long wavelength limit (q -> 0). The calculations of density of states of all these nanodisks reveal clearly that zigzag trigonal (ZT) nanodisk has the maximum magnetic moment of 3.969 mu(B). Further, the calculations related to optical properties indicate that the static value of real part of the dielectric constant and the real part of the refractive index assume maximum values for diamond shaped (DS) nanodisk in perpendicular polarization of the applied external electromagnetic (EM) field. However, in case of parallel polarization, significant changes in the static real part of dielectric constant and static refractive index are observed. Zero reflectivity is noticed around 3 eV and 5 eV for all nanodisks in parallel polarizations. Electron energy loss spectroscopy study reveals a presence of strong (intense) peak at 9 eV in perpendicular polarizations for all nanodisks. All these study may shed light on device fabrication in nano-opto-electronic technology and material characterization techniques. (C) 2015 Elsevier Ltd. All rights reserved.