Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 59: Complex Oxides Interfaces and Charge Order

TT 59.3: Talk

Thursday, April 4, 2019, 15:30–15:45, H22

Comparative study of the two-dimensional electron gas at the EuTiO₃(001) and SrTiO₃(001) surfaces — •manish verma¹, m. salluzzo^2,3, m. radovic³, j.h. dil⁴, and rossitza pentcheva⁵ — ¹Department of Physics and Center for Nanointegration (CENIDE), University of Duisburg-Essen, Germany — ²Dipartimento di Fisica, Università di Napoli Federico II, Italy — ³CNR-SPIN, Italy — ⁴Swiss Light Source and SwissFel, PSI, Switzerland — ⁵Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, Switzerland

Since the discovery of the two-dimensional electron gas (2-DEG) at the interface between the two band insulators LaAlO₃ and SrTiO₃ or at the SrTiO₃(001) surface, rich and intriguing physics has been uncovered at oxide interfaces. A significant effort concentrates on finding further possibly magnetic 2DEG oxide systems. EuTiO₃ serves as a suitable candidate in this direction, as it exhibits an antiferromagnetic ground state below 5.5K switchable to a ferromagnetic one by doping or lattice strain. In a combined density functional theory+U calculations with a Hubbard U on Eu 4f and Ti 3d states and angle resolved photoemission spectroscopy we explore the properties of the 2DEG at EuTiO₃(001) surface and compare to the much studied SrTiO₃(001) surface. In particular we focus on the effect of spin-orbit coupling on the 2DEGs at the two surfaces.

Funding by the DFG, CRC/TRR80 project G3 and computational time at magnitUDE supercomputer at University of Duisburg-Essen are acknowledged.