Recent findings of topological band structures in two-dimensional electron gases (2DEGs) at surfaces and interfaces of transition metal oxides are opening up new perspectives for the engineering of multifunctional materials. Spin-orbit interactions are enhanced at boundaries and their sizable magnitude can be tuned by gates effectively modulating the superconductivity and the spintronic regime that are found in these 2DEGs. Spin-orbit and Coulomb interactions also affect the topological character of the bands.
M. Vivek, M. O. Goerbig & M. Gabay. Topological states at the (001) surface of SrTiO3. Physical Review B 95, 165117 (2017).
M. Altmeyer, H. O. Jeschke, O. Hijano-Cubelos, C. Martins, F. Lechermann, K. Koepernik, ... M. Gabay. Magnetism, Spin Texture, and In-Gap States: Atomic Specialization at the Surface of Oxygen-Deficient SrTiO3. Physical Review Letters 116, 157203 (2016).
- Mott insulators