| We present the charge density profile, Fermi surface topology, and optical excitation spectra of LaAlO3/SrTiO3 heterostructures using a tight-binding model. With self-consistent Hartree approximation, we find that only one yz and one xz bands are occupied which give dominant contributions to the long-distance tail of the induced interface charge. We also study the optical excitation spectra by calculating dielectric function with random phase approximation and compare the spectra with experimental data. |
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