Determining the Rashba parameter from the bilinear magnetoresistance response in a two-dimensional electron gas

Abstract

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 LaAlO${}_3$/SrTiO${}_3$ 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, consistently with theoretical predictions.

References in corpus (12)

• Spin Hall effect
• Graphene Spintronics
• Emergent Phenomena Induced by Spin-Orbit Coupling at Surfaces and Interfaces
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Suppression of the Persistent Spin Hall Current by Defect Scattering
• A Universal Critical Density Underlying the Physics of Electrons at the LaAlO3/SrTiO3 Interface
• Bilinear magneto-electric resistance as a probe of three-dimensional spin texture in topological surface states
• Quasiparticle dynamics and spin-orbital texture of the SrTiO3 two-dimensional electron gas
• Spin Proximity Effects in Graphene/Topological Insulator Heterostructures
• Observation of Large Unidirectional Rashba Magnetoresistance in Ge(111)
• Theory of bi-linear magnetoresistance within the minimal model for surface states in topological insulators
• Current-driven spin orbit field in LaAlO3/SrTiO3 heterostructures

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• Direct visualization of Rashba-split bands and spin/orbital-charge interconversion at KTaO${}_3$ interfaces
• Non-linear Transport in Non-centrosymmetric Systems: From Fundamentals to Applications
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• Bilinear magnetoresistance in HgTe topological insulator: opposite signs at opposite interfaces demonstrated by gate control
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• Symmetry Origin and Microscopic Mechanism of Electrical Magnetochiral Anisotropy in Tellurium
• Anomalous Nonlinear Magnetoconductivity in van der Waals Magnet CrSBr
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• Leveraging high fluence and low pressure for pulsed laser deposition of high-mobility $\gamma$-Al${}_2$O${}_3$/SrTiO${}_3$ heterostructure growth
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• Orbital and Spin Edelstein Effects in KTaO${}_3$(110) Two-Dimensional Electron Gases
• Lithography-free patterning of SrTiO${}_3$-based two-dimensional electron gases using direct atomic layer processing
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