Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Low-Dimensional Systems: Oxide Hetero-Interfaces
TT 8.10: Vortrag
Montag, 16. März 2015, 12:00–12:15, H 3010
Spin-orbit controlled capacitance of a polar heterostructure — •Kevin Steffen1, Florian Loder2, and Thilo Kopp1 — 1Center for Electronic Correlations and Magnetism, EP VI, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany — 2Center for Electronic Correlations and Magnetism, EP VI and TP III, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
Oxide heterostructures with polar films display special electronic properties, such as the electronic reconstruction at their internal interfaces with the formation of two-dimensional metallic states. Moreover, the electrical field from the polar layers is inversion-symmetry breaking and may generate a strong Rashba spin-orbit coupling (RSOC) in the interfacial electronic system. We investigate the capacitance of a heterostructure in which a strong RSOC at a metallic interface is controlled by the electric field of a surface electrode. Such a structure is for example given by a LaAlO3 film on a SrTiO3 substrate which is gated by a top electrode. We find that due to a strong RSOC the capacitance can be larger than the classical geometric value.