Dirac-like fermions anomalous magneto-transport in a spin-polarized oxide two-dimensional electron system
Abstract
In two-dimensional electron systems (2DES) the breaking of the inversion, time-reversal and bulk crystal-field symmetries is interlaced with the effects of spin-orbit coupling (SOC) triggering exotic quantum phenomena. Here, we used epitaxial engineering to design and realize a 2DES characterized simultaneously by ferromagnetic order, large Rashba SOC and hexagonal band warping at the (111) interfaces between LaAlO, EuTiO and SrTiO insulators. The 2DES displays anomalous quantum corrections to the magneto-conductance driven by the time-reversal-symmetry breaking occurring below the magnetic transition temperature. The results are explained by the emergence of a non-trivial Berry phase and competing weak anti-localization / weak localization back-scattering of Dirac-like fermions, mimicking the phenomenology of gapped topological insulators. These findings open perspectives for the engineering of novel spin-polarized functional 2DES holding promises in spin-orbitronics and topological electronics.
Keywords
Cite
@article{arxiv.2406.14029,
title = {Dirac-like fermions anomalous magneto-transport in a spin-polarized oxide two-dimensional electron system},
author = {Yu Chen and Maria D'Antuono and Mattia Trama and Daniele Preziosi and Benoit Jouault and Frédéric Teppe and Christophe Consejo and Carmine A. Perroni and Roberta Citro and Daniela Stornaiuolo and Marco Salluzzo},
journal= {arXiv preprint arXiv:2406.14029},
year = {2026}
}