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O: Fachverband Oberflächenphysik

O 79: Electronic structure II

O 79.8: Talk

Thursday, March 17, 2011, 16:45–17:00, WIL C107

Unveiling a two-dimensional electron gas with universal subbands at the surface of SrTiO₃ — •Olivier Copie^1,2, Andrés Felipe Santander-Syro³, Takeshi Kondo⁴, Marcelo Rozenberg⁵, and Agnès Barthélémy² — ¹Universität Würzburg, Experimentelle Physik VII, 97074 Würzburg, Germany — ²Unité Mixte de Physique CNRS/Thales, 1 Av. A. Fresnel 91767 Palaiseau, France. — ³CSNSM, Université Paris-Sud and CNRS/IN2P3 Bâtiments 104 et 108, 91405 Orsay, France. — ⁴Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, IA 50011. — ⁵Laboratoire de Physique des Solides, Université Paris-Sud, Bâtiments 510, 91405 Orsay, France.

We present our angle-resolved photoemission spectroscopy (ARPES) results showing that there is a highly metallic universal two-dimensional electron gas (2DEG) at the vacuum-cleaved surface of SrTiO₃, independent of bulk carrier densities. Our data unveil a remarkable electronic structure consisting on multiple subbands of heavy and light electrons. The similarity of this 2DEG with those reported in SrTiO₃-based heterostructures suggests that different forms of electron confinement at the surface of SrTiO₃ lead to essentially the same 2DEG.