Empirical Tight Binding Modeling of InAs/InAs_1-xSb_x Ternary-Based Strain-Balanced Superlattices

We report quantum mechanical based band structure modeling of ternary- strain-balanced superlattice. A modified sp3s* empirical tight binding method along with virtual crystal approximation were used to model the ternary InAs/InAs<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</inf>Sb<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</inf> strain-balanced superlattice and generate fitting parameters for the empirical tight-binding method. The simulation results show agreement with bandgaps extracted from experimental results for the ternary-based strain-balanced superlattices. Superlattice design and simulated band structure around the Γ-point was extracted to confirm the flexibility of material system and the efficiency of empirical tight binding method.