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Dirac-Like Fermions Anomalous Magneto-Transport in a Spin-Polarized Oxide 2D Electron System
Yu Chen1, Maria D'Antuono2,3, Mattia Trama4,5
1CNR-SPIN, Complesso Univ. Monte S. Angelo, Naples, I-80126, Italy.
Advanced Materials (Deerfield Beach, Fla.)
|October 30, 2024
Summary
Researchers engineered a 2D electron system (2DES) with ferromagnetic order and strong spin-orbit coupling (SOC). This system exhibits unique quantum effects, paving the way for advanced spintronics and topological electronics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Phenomena
Background:
- Two-dimensional electron systems (2DES) exhibit exotic quantum phenomena when symmetries like inversion and time-reversal are broken, coupled with spin-orbit coupling (SOC).
- Engineering these properties is key to exploring novel electronic behaviors and materials.
Purpose of the Study:
- To design and realize a 2DES with simultaneous ferromagnetic order, large Rashba SOC, and hexagonal band warping.
- To investigate the quantum transport properties and underlying physics in this engineered system.
Main Methods:
- Epitaxial growth techniques were employed to create interfaces between LaAlO3, EuTiO3, and SrTiO3 insulators.
- Magneto-conductance measurements were performed to analyze the electronic behavior of the 2DES.
Main Results:
- A 2DES with ferromagnetic order, significant Rashba SOC, and hexagonal band warping was successfully realized at the engineered interfaces.
- Anomalous quantum corrections to magneto-conductance were observed, linked to time-reversal symmetry breaking below the magnetic transition temperature.
- The observed phenomena were attributed to a non-trivial Berry phase and competing weak anti-localization/weak localization effects of Dirac-like fermions.
Conclusions:
- The engineered 2DES mimics the behavior of gapped topological insulators.
- These findings offer new possibilities for creating spin-polarized 2DES for applications in spintronics and topological electronics.
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