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The type-II Dirac fermions that are characterized by a tilted Dirac cone andanisotropic magneto-transport properties have been recently proposedtheoretically and confirmed experimentally. Here, we predict the emergence oftwo-dimensional type-II Dirac fermions in LaAlO3/LaNiO3/LaAlO3 quantum-wellstructures. Using first-principles calculations and model analysis, we showthat the Dirac points are formed at the crossing between the dx2-y2 and dz2bands protected by the mirror symmetry. The energy position of the Dirac pointscan be tuned to appear at the Fermi energy by changing the quantum-well width.For the quantum-well structure with a two-unit cell thick LaNiO3 layer, wepredict the coexistence of the type-II Dirac points and the Dirac nodal line.The results are analyzed and interpreted using a tight-binding model andsymmetry arguments. Our findings offer a practical way to realize the 2Dtype-II Dirac fermions in oxide heterostructures.

Two-dimensional type-II Dirac fermions in a LaAlO3/LaNiO3/LaAlO3 quantum well