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Orbital and Spin Edelstein Effects in KTaO3(110) Two-Dimensional Electron Gases
Hugo Witt1,2, Aravind Raji3, Srijani Mallik1,4
1Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France.
Advanced Materials (Deerfield Beach, Fla.)
|July 17, 2026
Summary
The orbital Edelstein effect in KTaO3 (110) generates orbital polarization, crucial for orbitronics. This study quantifies its significant contribution to harmonic transport, advancing quantum oxide research.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Electronics
Background:
- The orbital Edelstein effect (OEE) converts electric fields into orbital polarization, a key phenomenon for orbitronics.
- Quantitative validation and microscopic understanding of OEE are limited, particularly in quantum oxide systems.
Purpose of the Study:
- To investigate and provide experimental evidence for the OEE in KTaO3 (110) two-dimensional electron gases (2DEGs).
- To elucidate the role of OEE in the anisotropic harmonic transport response of KTaO3 (110) 2DEGs.
- To establish KTaO3 (110) as a model system for orbitronics research.
Main Methods:
- Utilized scanning transmission electron microscopy and electron energy-loss spectroscopy to determine interfacial atomic structure.
- Performed density-functional calculations and angle-resolved photoemission spectroscopy to analyze electronic band structure.
- Employed a tight-binding model to compute spin and orbital Edelstein responses.
- Conducted harmonic magnetotransport measurements to probe transport anisotropy.
Main Results:
- Established a direct link between atomic structure and electronic band dispersions in KTaO3 (110) 2DEGs.
- Provided experimental evidence for a significant orbital Edelstein contribution to harmonic transport.
- Quantified the orbital Edelstein contribution to be approximately 20%, explaining the observed anisotropic response.
- Demonstrated that the spin Edelstein effect alone cannot account for the experimental observations.
Conclusions:
- KTaO3 (110) 2DEGs serve as an excellent platform for studying and advancing orbitronics.
- The study validates the significant role of the orbital Edelstein effect in quantum oxide systems.
- Findings offer insights into generating and controlling orbital polarization and potential implications for superconductivity mechanisms.
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