Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 100: Electronic Structure of Surfaces: Spectroscopy, Surface States II
O 100.7: Vortrag
Donnerstag, 23. März 2017, 17:30–17:45, WIL C307
Manipulation of two-dimensional states at the XTiO3 surface (X=Sr, Ba, Ca) — •Stefan Muff1,2, Mauro Fanciulli1,2, Nicolas Pilet2, Andrew Weber1,2, Zoran Ristic2, Zhiming Wang2, Nicholas Plumb2, Milan Radovic2,3, and Hugo Dil1,2 — 1Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, Switzerland — 2Swiss Light Source, Paul Scherrer Institut, Switzerland — 3SwissFEL, Paul Scherrer Institut, Switzerland
The discovery of a two dimensional electron gas (2DEG) at the surfaces of clean SrTiO3 and KTaO3 triggered research into possibilities to manipulate its characteristics in a controlled manner, using the wide range of physical properties as ferroelectricity, superconductivity, and giant magneto resistance observed in this class of materials. A more direct way to influence the properties of the 2DEG is by chemical or lattice strain and by changes of the atomic structure of the sample surface. In this work we grow films of different perovskites by the help of pulsed laser deposition and studied the formation and properties of the 2DEG by UV ARPES.
We will show the existence of two dimensional states at the surface of of BaTiO3 and CaTiO3 films, whose properties are closely related, but different, to the states present on SrTiO3 and KTaO3. The growth of films with variable thicknesses and combinations of different perovskites, as well as the variation of surface geometry, gives us the ability to directly manipulate the properties of the two-dimensional as well as the three dimensional surface-related states.