Acoustical Dissipation in Some Tetrahedrally-Bonded Semiconducting Compounds

Complex Structures In Tetrahedrally Bonded Semiconductors

Complex tetrahedral structures form good models for amorphous Group IV and HI-V semiconductors. With a view of working towards examining non-crystalline materials, the structural, electronic and vibrational properties of complex tetrahedrally bonded semiconductors are investigated by various molecular dynamics techniques. First principles quantum mechanical molecular dynamics calculations are p...

Magnetic metastability in tetrahedrally bonded magnetic III-nitride semiconductors.

Results of density-functional calculations for isolated transition metal (TM = V, Cr, Mn, Fe, Co, Ni on cation sites) doped GaN demonstrate a novel magnetic metastability in dilute magnetic semiconductors. In addition to the expected high spin ground states (4muB/Mn and 5muB/Fe), there are also metastable low spin states (0muB/Mn and 1muB/Fe)--a phenomenon that can be explained in simple terms ...

Cation-anion vacancy complexes in semiconducting compounds

Interstitial channels that control band gaps and effective masses in tetrahedrally bonded semiconductors.

We find that electron states at the bottom of the conduction bands of covalent semiconductors are distributed mainly in the interstitial channels and that this floating nature leads to the band-gap variation and the anisotropic effective masses in various polytypes of SiC. We find that the channel length, rather than the hexagonality prevailed in the past, is the decisive factor for the band-ga...

A review of the electronic and magnetic properties of tetrahedrally bonded half-metallic ferromagnets.

The emergence of the field of spintronics has brought half-metallic ferromagnets to the centre of scientific research. A lot of interest was focused on newly created transition-metal pnictides (such as CrAs) and chalcogenides (such as CrTe) in the metastable zinc-blende lattice structure. These compounds were found to have the advantage of high Curie temperatures in addition to their structural...