Observation of a two-dimensional electron gas at the surface of annealed SrTiO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow/><mml:mn>3</mml:mn></mml:msub></mml:math>single crystals by scanning tunneling spectroscopyR. Di Capua, M. Salluzzo|Physical Review B|2012Cited by 44