Anisotropic two-dimensional electron gas at the LaAlO 3 /SrTiO 3 (110) interface

Although LaAlO3 and SrTiO3 are both insulators, when they are brought together at a (100) interface, a highly conducting two-dimensional electron gas forms between them. Annandi et al. show that this also happens at a (110) interface, counter to expectations that it should not.