Title: (LaTiO$_3$)$_n$/(LaVO$_3$)$_n$ as a model system for unconventional charge transfer and polar metallicity,
Abstract: At interfaces between oxide materials, lattice and electronic reconstructions
always play important roles in exotic phenomena. In this study, the density
functional theory and maximally localized Wannier functions are employed to
investigate the (LaTiO$_3$)$_n$/(LaVO$_3$)$_n$ magnetic superlattices. The
electron transfer from Ti$^{3+}$ to V$^{3+}$ is predicted, which violates the
intuitive band alignment based on the electronic structures of LaTiO$_3$ and
LaVO$_3$. Such unconventional charge transfer quenches the magnetism of
LaTiO$_3$ layer mostly and leads to metal-insulator transition in the $n=1$
superlattice when the stacking orientation is altered. In addition, the
compatibility among the polar structure, ferrimagnetism, and metallicity is
predicted in the $n=2$ superlattice.