Journal
PHYSICAL REVIEW MATERIALS
Volume 4, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.4.071001
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Funding
- ERC [615759, 833976]
- National Science Center in Poland [UMO2018/31/D/ST3/02351]
- French Embassy through the French Government Scholarship (BGF 2019)
- Deutsche Forschungsgemeinschaft (DFG) [CRC/TRR 227]
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Two-dimensional (2D) Rashba systems have been intensively studied in the last decade due to their unconventional physics, tunability capabilities, and potential for spin-charge interconversion when compared to conventional heavy metals. With the advent of a new generation of spin-based logic and memory devices, the search for Rashba systems with more robust and larger conversion efficiencies is expanding. Conventionally, demanding techniques such as angle- and spin-resolved photoemission spectroscopy are required to determine the Rashba parameter alpha(R) that characterizes these systems. Here, we introduce a simple method that allows a quantitative extraction of alpha(R), through the analysis of the bilinear response of angle-dependent magnetotransport experiments. This method is based on the modulation of the Rashba-split bands under a rotating in-plane magnetic field. We show that our method is able to correctly yield the value of alpha(R) for a wide range of Fermi energies in the 2D electron gas at the LaAlO3/SrTiO3 interface. By applying a gate voltage, we observe a maximum alpha(R) in the region of the band structure where interband effects maximize the Rashba effect, consistent with theoretical predictions.
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