39 citations · 244 across the 22 of their papers we have counts for
6 papers · 1 filter
A perspective on effective medium models of thermal conductivity in (ultra)nanocrystalline diamond films
Titus Sandu, Catalin Tibeica
Thermal conductivity of nanocrystalline and ultra-nanocrystalline films is analyzed with effective medium theory (EMT) models. The existing EMT models use the spherical inclusion a…
Bandgaps and band bowing in semiconductor alloys
Titus Sandu, Radu I. Iftimie
The bandgap and band bowing parameter of semiconductor alloys are calculated with a fast and realistic approach. The method is a dielectric scaling approximation that is based on a…
Ab-initio calculations of spin tunneling through an indirect barrier
Athanasios N Chantis, Titus Sandu, Jialei L Xu
We use a fully relativistic layer Green's functions approach to investigate spin-dependent tunneling through a symmetric indirect band gap barrier like GaAs/AlAs/GaAs heterostructu…
Real space screened-exchange method for semiconductors and their alloys
Titus Sandu, R. I. Iftimie, M. van Schilfgaarde
This paper has been withdrawn by the author(s), due a crucial error in Eqn. 30.
Spin tunneling through an indirect barrier
Titus Sandu, Athanasios Chantis, Radu Iftimie
Spin-dependent tunneling through an indirect bandgap barrier like the GaAs/AlAs/GaAs heterostructure along [001] direction is studied by the tight-binding method. The tunneling is…
Optical matrix elements in tight-binding models with overlap
Titus Sandu
We investigate the effect of orbital overlap on optical matrix elements in empirical tight-binding models. Empirical tight-binding models assume an orthogonal basis of (atomiclike)…