The interface between the two band insulators SrTiO3 and LaAlO3 unexpectedly has the properties of a two dimensional electron gas. It is even superconducting with a transition temperature, Tc, that can be tuned using gate bias Vg, which controls the number of electrons added or removed from the interface. The gate bias - temperature (Vg, T) phase diagram is characterized by a dome-shaped region where superconductivity occurs, i.e., Tc has a non-monotonic dependence on Vg, similar to many unconventional superconductors. In this communication the frequency of the quantum resistance-oscillations versus inverse magnetic field is reported for various Vg. This frequency follows the same nonmonotonic behavior as Tc; similar trend is seen in the low field limit of the Hall coefficient. We theoretically show that electronic correlations result in a non-monotonic population of the mobile band, which can account for the experimental behavior of the normal transport properties and the superconducting dome.
@article{arxiv.1509.03449,
title = {Strong correlations elucidate the electronic structure and phase-diagram of LaAlO3/SrTiO3 interface},
author = {E. Maniv and M. Ben Shalom and A. Ron and M. Mograbi and A. Palevski and M. Goldstein and Y. Dagan},
journal= {arXiv preprint arXiv:1509.03449},
year = {2016}
}