The kinetic inductance of superconducting electron gas formed at KTaO₃ interfaces

The discovery of superconducting two-dimensional electron gases (2-DEG) in (111)-and (110)-oriented KTaO₃ (KTO)-based heterostructures has attracted new interest in the field of oxide interfaces. The kinetic inductance of the superfluid in KTO 2DEGs can be used to probe fundamental properties of the superconducting state, including the orientation selectivity of superconductivity at KTO interfaces and its tunability with external fields. We use coplanar waveguide resonators (SCWRs) made using superconducting KTO 2DEGs to probe their kinetic inductance, which is a direct measure of superfluid density. We will present our results on the temperature and gating-voltage dependent the kinetic inductance and discuss the implications of our results for the superconducting state in KTaO3-based 2-DEGs, as well as their use as a platform for resonant structures in applications.