Dirac-like fermions anomalous magneto-transport in a spin-polarized oxide two-dimensional electron system

• DOI: 10.48550/arxiv.2406.14029
• Publication Date: 2024-06-20
• Authors: Yu Chen; Maria D’Antuono; Mattia Trama; Daniele Preziosi; B. Jouault; F. Teppe; C. Conséjo; C. A. Perroni; R. Citro; D. Stornaiuolo; M. Salluzzo
• Keywords: Magneto; Helical Dirac fermion

In two-dimensional electron systems (2DES) the breaking of inversion, time-reversal and bulk crystal-field symmetries is interlaced with effects spin-orbit coupling (SOC) triggering exotic quantum phenomena. Here, we used epitaxial engineering to design realize a 2DES characterized simultaneously by ferromagnetic order, large Rashba SOC hexagonal band warping at (111) interfaces between LaAlO$_{3}$, EuTiO$_{3}$ SrTiO$_{3}$ insulators. The displays anomalous corrections magneto-conductance driven time-reversal-symmetry occurring below magnetic transition temperature. results are explained emergence non-trivial Berry phase competing weak anti-localization / localization back-scattering Dirac-like fermions, mimicking phenomenology gapped topological These findings open perspectives for novel spin-polarized functional holding promises in spin-orbitronics electronics.