Abstract
The Edelstein effect provides the purely electrical generation and control of a homogeneous magnetization in primarily nonmagnetic materials with broken inversion symmetry. Usually, only the spin density response to an external electric field is discussed. Here, we report on the electrically induced magnetization containing spin as well as orbital contributions in the topological oxide two-dimensional electron gas at the interface between SrTiO$_3$ and AlO. We find that in this particular system the orbital Edelstein effect exceeds the spin Edelstein effect by more than one order of magnitude. The main reason are orbital moments of different magnitude in the Rashba-like-split band pairs.
Highlights
One focus of the field of spintronics is to identify methods which allow us to generate and manipulate spin-polarized electric currents efficiently, with the goal to realize powerful and nonvolatile electronic devices with reduced energy consumption [1]
The Edelstein effect produces a homogeneous magnetization in nonmagnetic materials with broken inversion symmetry which is generated and tuned exclusively electrically
The perhaps most-investigated phenomenon among the vast variety of spin-orbitronic effects is the spin Hall effect: a longitudinal charge current is accompanied by a transversal pure spin current or a spin voltage [6,7,8,9,10,11]
Summary
One focus of the field of spintronics is to identify methods which allow us to generate and manipulate spin-polarized electric currents efficiently, with the goal to realize powerful and nonvolatile electronic devices with reduced energy consumption [1]. The above findings call for a theoretical investigation of the SEE and OEE in the 2DEG at SrTiO3 (STO) interfaces, which do not show magnetic order in equilibrium This particular system lends itself for such a study because of its promising properties concerning spintronics: In particular, the interface between AlOx (AO) and SrTiO3 (STO) provides a sizable (inverse) Edelstein effect in both theory and experiment, mainly because of its large spin-orbit coupling, topological properties. We predict a net OEE originating from the electrons’ orbital motion that is more than one order of magnitude larger than its spin companion Their dependence on the Fermi energy is traced back to band-resolved Edelstein signals. We suggest experiments to probe the large orbital contribution to the charge-magnetization interconversion, which is highly favorable for spin-orbitronic applications
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