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Nonzero Berry phase in quantum oscillations from giant Rashba-type spin splitting in LaTiO3/SrTiO3 heterostructures
M J Veit1, R Arras2, B J Ramshaw3,4
1Department of Applied Physics and Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, 94305, USA. mjveit@stanford.edu.
Nature Communications
|April 15, 2018
Summary
Researchers found a giant Rashba-type spin splitting at the LaTiO3/SrTiO3 interface. This discovery in oxide systems offers new possibilities for developing advanced spintronic devices without magnetic fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Spintronic devices aim for high-speed, low-power computation by manipulating electron spin.
- Current spintronic devices often rely on magnetic fields for spin splitting.
- Rashba-type splitting offers an alternative, utilizing spatial symmetry breaking without magnetic fields.
Purpose of the Study:
- To investigate the presence and magnitude of Rashba-type spin splitting at the LaTiO3/SrTiO3 interface.
- To explore the potential of oxide interfaces for novel spintronic applications.
Main Methods:
- Experimental analysis of magnetotransport properties.
- Observation of anisotropic magnetoresistance.
- Detection of weak anti-localization and quantum oscillations.
Main Results:
- Evidence for a giant Rashba-type spin splitting at the LaTiO3/SrTiO3 interface.
- Magnetotransport data consistent with significant spin-orbit coupling effects.
- Demonstration of Rashba-type splitting in a 3d transition metal oxide system.
Conclusions:
- The LaTiO3/SrTiO3 interface exhibits a substantial Rashba-type spin splitting.
- This finding is significant for oxide-based spintronics, offering a magnetic-field-free approach.
- Opens avenues for developing next-generation oxide spintronic devices.
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