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TT: Fachverband Tiefe Temperaturen
TT 94: Low-Dimensional Systems: Oxide Hetero-Interfaces
TT 94.7: Talk
Thursday, April 3, 2014, 16:45–17:00, HSZ 204
Spin-orbit coupling in 2DEGs at a polar/non-polar oxide interface — •Kourosh Rahmanizadeh, Gustav Bihlmayer, Daniel Wortmann, and Stefan Blügel — Peter Grünberg Institut (PGI-1) & Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany
The investigation of a two-dimensional electron gas (2DEG) at the polar / non-polar oxide
interface (e.g. the discovery of highly mobile electrons at the LaAlO3 / SrTiO3
interface) is attractive for spintronic applications. Similar to the 2DEGs formed in
semiconductor heterostructures, Rashba spin-orbit coupling (SOC) can have a big impact for
the magnetotransport properties at these oxide interfaces [1]. Moreover, the combination
of Rashba SOC and magnetic (or exchange) fields offer unique properties sought for in the
hunt for Majorana fermions [2].
The BiAlO3 (BAO) exhibits the same polar layers as LaAlO3. The ferroelectricity of
the material further allows to manipulate the carrier density at the interface. Using
density functional theory, we investigated the 2DEG in BAO/SrTiO3, BAO/EuTiO3
and BAO/Sr2NiWO6 heterostructures. In the latter two structures, the proximity to
ferroelectric insulators breaks the time-reversal symmetry in the 2DEG and leads, in
combination with Rashba SOC to a single Fermi surface, analogous to the situation in
topological insulators.
Financial support of the EU grant NMP3-LA-2010-246102 (IFOX) is gratefully acknowledged.
A. D. Caviglia et al., Phys. Rev. Lett. 104, 126803 (2010).
J. D. Sau et al., Phys. Rev. Lett. 104, 040502 (2010).