Anisotropic physical properties in the KTaO₃ (110) interface

The two-dimensional superconductivity found at the KTaO₃ interfaces offers new opportunities for investigating emergent physical phenomena. Depending on the crystalline orientation of the KTaO₃ interface, superconducting properties such as T_c can be distinct. Here we report on anisotropic physical properties observed in the electron gas formed at the KTaO₃ (110) interface. We find that the transport properties in the normal state are dependent on the crystal axis. This can be understood from an anisotropic electronic band structure calculated from a tight-binding model. At lower temperatures in the superconducting state, we observe a rotational anisotropy in the magnetotransport measurements for in-plane magnetic fields, after careful control of the direction of the magnetic field due to unavoidable sample misalignment during mounting. This observation suggests an anisotropic spin susceptibility at the KTaO₃ (110) interface.