Structure and electronic properties ofFeSi2

Abstract

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Table of Magnetic Dipole Rotational Bands

“…In Fig. 4 [193][194][195][196][197] has confirmed the decrease in B(M1) with increasing angular momentum [11]. This constitutes the strongest argument in favor of the shears mechanism in lead nuclei.…”

Dependence of direct transition energy on growth temperature in β-FeSi2 epitaxial films

“…Therefore, electronic structure and optical property of β-FeSi2 epitaxial films are considered to be modified by the strain induced at the heteroepitaxial interface of β-FeSi2/Si. The strain effects on the electronic structure have been investigated by first principle calculations [4][5][6][7][8], but there have been no experimental result about the modification of electronic structure. In our recent studies, we have investigated lattice deformations and direct transition energies (Eg) in β-FeSi2 epitaxial films grown on Si(111) substrate, and revealed that the Eg shifted to lower energy by the lattice shrinkage induced by thermal annealing [9,10].…”

Indirect optical absorption and origin of the emission from β-FeSi2 nanoparticles: Bound exciton (0.809 eV) and band to acceptor impurity (0.795 eV) transitions

“…7 Moreover, this band gap has a high sensitiveness to lattice distortions and it is expected that the presence of suitable strain fields will make it possible to transform it into a direct one with a strong oscillator strength. 8,9 From this point of view, the study of the formation of isolated nanoparticles will be of interest to explore that prediction and additionally to complement low-dimensional structure knowledge for optoelectronic applications. Previous experiments by Grimaldi et al 10 and Martinelli et al 11 showed that elastically strained ball-shaped particles ͑formed by ion-beam synthesis͒ surrounded by a defect-free matrix do not have luminescence properties, whereas unstrained disk-shaped particles in a matrix with a large number of defects emit around 0.805 eV.…”

“…In the process we tested the band gap conversion-indirect to direct when the nanoparticles are under strain. 8,9 In Sec. II we describe the experimental procedures.…”