Nonzero Berry phase in quantum oscillations from giant Rashba-type spin splitting in LaTiO3/SrTiO3 heterostructures

M. J. Veit (), R. Arras, B. J. Ramshaw, R. Pentcheva and Y. Suzuki
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M. J. Veit: Stanford University
R. Arras: University of Toulouse, CNRS, UPS
B. J. Ramshaw: Los Alamos National Laboratory
R. Pentcheva: University of Duisburg-Essen
Y. Suzuki: Stanford University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract The manipulation of the spin degrees of freedom in a solid has been of fundamental and technological interest recently for developing high-speed, low-power computational devices. There has been much work focused on developing highly spin-polarized materials and understanding their behavior when incorporated into so-called spintronic devices. These devices usually require spin splitting with magnetic fields. However, there is another promising strategy to achieve spin splitting using spatial symmetry breaking without the use of a magnetic field, known as Rashba-type splitting. Here we report evidence for a giant Rashba-type splitting at the interface of LaTiO3 and SrTiO3. Analysis of the magnetotransport reveals anisotropic magnetoresistance, weak anti-localization and quantum oscillation behavior consistent with a large Rashba-type splitting. It is surprising to find a large Rashba-type splitting in 3d transition metal oxide-based systems such as the LaTiO3/SrTiO3 interface, but it is promising for the development of a new kind of oxide-based spintronics.

Date: 2018
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DOI: 10.1038/s41467-018-04014-0

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