Enhancement of Rashba spin-orbit coupling by electron-electron interaction

Abstract

We studied how the electron-electron (e-e) interaction enhances the strength of the Rashba spin-orbit coupling (RSOC) and opens the possibility of generating a spin-polarized output current from an unpolarized electric current without any magnetic elements. In this regard, we proposed a novel design of a graphene-like junction based on the $e$-$e$ interaction and the $RSOC$. The results showed that the $e$-$e$ interaction with $RSOC$ opens a spin energy gap and extremely enhances the $RSOC$ in this spin energy gap. Interestingly, the junction produces a large spin-polarized current and could act as a high-efficiency spin filter device (nearly 100\% spin polarization) at room temperature even at low Rashba and e-e interaction strengths. However, with an appropriate design, we showed that RSOC could strongly weaken the spin-polarized current and the spin energy gap, which is solely produced by the $e$-$e$ interaction, but a high spin polarization persists in some energy ranges.

References in corpus (29)

• The electronic properties of graphene
• Quantum Spin Hall Effect in Graphene
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Two and one-dimensional honeycomb structures of silicon and germanium
• Quantum Spin Hall Effect in Silicene
• New Perspectives for Rashba Spin-Orbit Coupling
• Basic obstacle for electrical spin-injection from a ferromagnetic metal into a diffusive semiconductor
• Valley filter and valley valve in graphene
• Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
• Spin-orbit coupling in curved graphene, fullerenes, nanotubes, and nanotube caps
• Room temperature magnetic order on zigzag edges of narrow graphene nanoribbons
• Possible Spin Polarization in a One-Dimensional Electron Gas
• Impurity induced spin-orbit coupling in graphene
• Rashba effect in the graphene/Ni(111) system
• Gated Silicene as a tunable source of nearly 100% spin-polarized electrons
• All-electric all-semiconductor spin field effect transistors
• Kondo model for the "0.7 anomaly" in transport through a quantum point contact
• Observation of a One-Dimensional Spin-Orbit Gap in a Quantum Wire
• All-Electric Quantum Point Contact Spin Valve
• Bias-controllable intrinsic spin polarization in a quantum dot
• Half-Metallic Silicene and Germanene Nanoribbons: towards High-Performance Spintronics Device
• Odd and even Kondo effects from emergent localisation in quantum point contacts
• Phase coherent quantum mechanical spin tranport in a weakly disordered quasi one-dimensional channel
• Symmetries of quantum transport with Rashba spin-orbit: Graphene spintronics
• The Effect of Ramsauer Type Transmission Resonances on the Conductance Modulation of Spin Interferometers
• From Coulomb blockade to the Kondo regime in a Rashba dot
• Possible origin of the 0.5 plateau in the ballistic conductance of quantum point contacts
• Magnetic edge states in Aharonov-Bohm graphene quantum rings
• Generation of fully spin-polarized currents in three-terminal graphene-based transistors