Refine
Year of publication
Document Type
Way of publication
- Open Access (2)
Language
- English (39)
Keywords
- Superconducting properties and materials (3)
- Electronic properties and materials (2)
- charge density fluctuations (2)
- cuprates (2)
- Anisotropic scattering (1)
- Charge-density waves (1)
- Condensed Matter (1)
- Electronic phase separation (1)
- High-Tc superconducting cuprates (1)
- Inhomogeneity (1)
- Molecular electronics (1)
- Oxide interfaces (1)
- Polymers (1)
- Rashba spin–orbit coupling (1)
- Spin Hall effect (1)
- Spin polarization (1)
- Spin-orbit coupling (1)
- Spintronics (1)
- Superconductivity (1)
- Two-dimensional electron gas (1)
- diffusive modes (1)
- dynamical quantum criticality (1)
- high-temperature cuprate superconductors (1)
- high-temperature superconductors (1)
- lattice models (1)
- marginal Fermi liquid (1)
- spin-galvanic effect (1)
- spintronics (1)
- strange metal (1)
- strange metal behavior (1)
- strange-metal behavior (1)
- strongly correlated systems (1)
Institute
There is steadily increasing evidence that the two-dimensional electron gas (2DEG) formed at the interface of some insulating oxides like LaAlO3/SrTiO3 and LaTiO3/SrTiO3 is strongly inhomogeneous. The inhomogeneous distribution of electron density is accompanied by an inhomogeneous distribution of the (self-consistent) electric field confining the electrons at the interface. In turn this inhomogeneous transverse electric field induces an inhomogeneous Rashba spin-orbit coupling (RSOC). After an introductory summary on two mechanisms possibly giving rise to an electronic phase separation accounting for the above inhomogeneity, we introduce a phenomenological model to describe the density-dependent RSOC and its consequences. Besides being itself a possible source of inhomogeneity or charge-density waves, the density-dependent RSOC gives rise to interesting physical effects like the occurrence of inhomogeneous spin-current distributions and inhomogeneous quantum-Hall states with chiral “edge” states taking place in the bulk of the 2DEG. The inhomogeneous RSOC can also be exploited for spintronic devices since it can be used to produce a disorder-robust spin Hall effect.
LaAlO 3/SrTiO 3 and LaTiO 3/SrTiO 3 (LXO / STO) interfaces are known to host a strongly inhomogeneous (nearly) two-dimensional electron gas (2DEG). In this work, we present three unconventional electronic mechanisms of electronic phase separation (EPS) in a 2DEG as a possible source of inhomogeneity in oxide interfaces. Common to all three mechanisms is the dependence of some (interaction) potential on the 2DEGs density. We first consider a mechanism resulting from a sizable density-dependent Rashba spin-orbit coupling. Next, we point out that an EPS may also occur in the case of a density-dependent superconducting pairing interaction. Finally, we show that the confinement of the 2DEG to the interface by a density-dependent, self-consistent electrostatic potential can by itself cause an EPS.
On the Evaluation of the Spin Galvanic Effect in Lattice Models with Rashba Spin-Orbit Coupling
(2018)
The spin galvanic effect (SGE) describes the conversion of a non-equilibrium spin polarization into a charge current and has recently attracted renewed interest due to the large conversion efficiency observed in oxide interfaces. An important factor in the SGE theory is disorder which ensures the stationarity of the conversion. Through this paper, we propose a procedure for the evaluation of the SGE on disordered lattices which can also be readily implemented for multiband systems. We demonstrate the performance of the method for a single-band Rashba model and compare our results with those obtained within the self-consistent Born approximation for a continuum model.