Orbital Reconstruction and the Two-Dimensional Electron Gas at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>LaAlO</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>Interface
M. Salluzzo(Coherent (United States)), J. C. Cezar(European Synchrotron Radiation Facility), N. B. Brookes(European Synchrotron Radiation Facility), Valentina Bisogni(European Synchrotron Radiation Facility), G. M. De Luca, Christoph Richter(University of Augsburg), Stefan Thiel(University of Augsburg), J. Mannhart(University of Augsburg), Mark Huijben(University of Twente), Alexander Brinkman(University of Twente), Guus Rijnders(University of Twente), G. Ghiringhelli(Politecnico di Milano)
Cited by 305Open Access
Abstract
In 2004, Ohtomo and Hwang discovered that an electron gas is created at the interface between insulating LaAlO3 and SrTiO3 compounds. Here we show that the generation of a conducting electron gas is related to an orbital reconstruction occurring at the LaAlO3/SrTiO3 interface. Our results are based on extensive investigations of the electronic properties and of the orbital structure of the interface using x-ray absorption spectroscopy. In particular, we find that the degeneracy of the Ti 3d states is fully removed and that the Ti 3d xy levels become the first available states for conducting electrons.
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