A magnetic field sensitive interfacial metallic state in a crystalline insulator

We report strongly magnetic field dependent transport in crystalline strontium titanate at the interface with an ion beam treated nanolayer. Microscopy shows that this interface is atomically sharp. The results obtained suggest a chemical potential driven transfer of high mobility electrons through the interface into the crystal. This phenomenon provides a strategy for device fabrication without disorder in the conduction channel. We show, for nonmagnetic metals, magnetoresistance and plateau-like Hall magneto-dependence, possibly caused by electron cyclotron effects in a strongly correlated quasi-two-dimensional Fermi gas.