The band offset barrier and optical properties calculation of Co2VGa/GaAs(001) interfaces: A DFT study

The structural, electronic, optical properties and band offsets of Co2VGa/GaAs(001) interfaces are discussed within the framework of density functional theory (DFT) using the FP-LAPW method, and the exchange-correlation potential is approximated by GGA. All interface structures are stable in the energy point of view, however the V-Ga/As case is found to be more stable than the others. A remarkable potential difference (Delta V) appeared in all the interfaces, so the Co2VGa/GaAs(001) interfaces are good candidates for electron injection. In all the cases, there is no full spin polarization at the Fermi level, but high CBO and Phi(p) coefficients make them promising candidates for spin injection in the transport devices. Optical studies confirm the high metallic treatment of these interfaces as the main electron transitions had occurred in the infrared and visible regions. The real parts of the dielectric function in the x-direction indicate the different behaviors of "Co-Co/As and V-Ga/Ga" and "Co-Co/Ga and V-Ga/As" in the infrared area. In addition, the plasmon frequencies had occurred at high UV energies.