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${}_3$, EuTiO${}_3$ and SrTiO${}_3$ 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.

References in corpus (11)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
• Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
• Spin Hall effect and Berry phase in two dimensional electron gas
• Spin-charge interconversion in KTaO${}_3$ two-dimensional electron gases
• Designing spin and orbital sources of Berry curvature at oxide interfaces
• Link between the Superconducting Dome and Spin-Orbit Interaction in the (111) LaAlO${}_3$/SrTiO${}_3$ Interface
• Gate tunable anomalous Hall effect: a Berry curvature probe at oxides interfaces
• Enhanced Non-linear Response by Manipulating the Dirac Point in the (111) LaTiO${}_3$/SrTiO${}_3$ Interface

Cited by in corpus (2)

• Edelstein Effect in Isotropic and Anisotropic Rashba Models
• Spin Hall and Edelstein effects in a ballistic quantum dot with Rashba spin-orbit coupling