Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 4: Electronic Structure of Surfaces I
O 4.2: Vortrag
Montag, 16. März 2015, 10:45–11:00, MA 041
Orientational Tuning Of The Two-Dimensional Electron Gases At The Low-Index Surfaces of SrTiO3 — •Tobias C. Rödel1,2, Cédric Bareille1, Franck Fortuna1, François Bertran2, Patrick Le Fèvre2, Thomas Maroutian3, Philippe Lecoeur3, Marc Gabay4, Marcelo J. Rozenberg4, and Andres F. Santander-Syro1 — 1CSNSM, Orsay, France — 2Synchrotron SOLEIL, Gif-sur-Yvette, France — 3IEF, Orsay, France — 4LPS, Orsay, France
Two-dimensional electron gases (2DEGs) in SrTiO3 have been studied extensively in the last decade after its discovery at the LaAlO3/SrTiO3 interface by Ohtomo & Hwang. This heterostructure displays many fundamentally interesting properties, such as field-effect induced insulator-to-superconductor transitions and the coexistence of magnetism and superconductivity.
To clarify the microcopic electronic structure of the 2DEG, we conducted angle resolved-photoemission spectroscopy (ARPES) experiments of a closely related system: the 2DEG at the surface of SrTiO3. Our group studied the 2DEGs at various different surface orientations of SrTiO3 (as well as KTaO3) at different synchrotron facilities.
Recent results demonstrate that the electronic structure of the 2DEG at the surface of SrTiO3 (Fermi surfaces, subband masses and orbital ordering) can be tuned by confining the electrons at different surface orientations. This occurs due to the different crystallographic symmetries of the surface and subsurface planes as well as the different effective electron masses along the confinement direction.