Guedes, Eduardo B.Muff, StefanBrito, Walber H.Caputo, MarcoLi, HangPlumb, Nicholas C.Dil, J. HugoRadovic, Milan2021-09-252021-09-252021-09-252021-09-1710.1002/advs.202100602https://infoscience.epfl.ch/handle/20.500.14299/181723WOS:000696492200001The 2-dimensional electron gas (2DEG) found at the surface of SrTiO3 and related interfaces has attracted significant attention as a promising basis for oxide electronics. In order to utilize its full potential, the response of this 2DEG to structural changes and surface modification must be understood in detail. Here, a study of the detailed electronic structure evolution of the 2DEG as a function of sample temperature and surface step density is presented. By comparing the experimental results with ab initio calculations, it is shown that local structure relaxations cause a metal-insulator transition of the system around 135 K. This study presents a new and simple way of tuning the 2DEG via surface vicinality and identifies how the operation of prospective devices will respond to changes in temperature.Chemistry, MultidisciplinaryNanoscience & NanotechnologyMaterials Science, MultidisciplinaryChemistryScience & Technology - Other TopicsMaterials Science2-dimensional electron gasangle-resolved photoemission spectroscopydensity functional theorystrontium titanatetotal-energy calculationsab-initiophase-transitionrelaxationscatteringtransportphononstio2text::journal::journal article::research article