Chiral tunneling in single layer graphene with Rashba spin-orbit coupling: spin currents
arXiv:2012.10971 · doi:10.1103/PhysRevB.103.134445
Abstract
We study forward scattering of 2D massless Dirac electrons at Fermi energy {\varepsilon} > 0 in single layer graphene through a 1D rectangular barrier of height {u_0} in the presence of uniform Rashba spin-orbit coupling (of strength λ). The role of the Klein paradox in graphene spintronics is thereby exposed. It is shown that (1) For {\varepsilon} - 2λ < {u_0}< {\varepsilon} + 2λ there is partial Klein tunneling, wherein the transmission is bounded by 1 and, quite remarkably, for small λ > {λ_0} {\approx} 0.1 meV, the transmission nearly vanishes when the scattering energy equals the barrier height, {\varepsilon}={u_0}. (2) Spin density and spin-current density are shown to be remarkably different than these observables predicted in bulk single layer graphene. In particular, they are sensitive to λ and {u_0}. (3) Spin current densities are space dependent, implying the occurrence of non-zero spin torque density. Such a system may serve as a graphene based spintronic device without the use of an external magnetic field or magnetic materials.
arXiv commentseven pages, six figures
References in corpus (45)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- Graphene: Status and Prospects
- Spintronics: Fundamentals and applications
- Chiral tunneling and the Klein paradox in graphene
- Electronic transport in two dimensional graphene
- Electronic spin transport and spin precession in single graphene layers at room temperature
- Biased bilayer graphene: semiconductor with a gap tunable by electric field effect
- Graphene Spintronics
- Andreev reflection and Klein tunneling in graphene
- Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
- Spin qubits in graphene quantum dots
- Spin-orbit coupling in curved graphene, fullerenes, nanotubes, and nanotube caps
- Spin-orbit gap of graphene: First-principles calculations
- Selective transmission of Dirac electrons and ballistic magnetoresistance of \textit{n-p} junctions in graphene
- Band-structure topologies of graphene: spin-orbit coupling effects from first principles
- Highly efficient spin transport in epitaxial graphene on SiC
- Graphene for spintronics: giant Rashba splitting due to hybridization with Au
- On A Proper Definition of Spin Current
- Graphene on transition-metal dichalcogenides: a platform for proximity spin-orbit physics and optospintronics
- Klein tunneling in graphene: optics with massless electrons
- Spin lifetimes exceeding 12 nanoseconds in graphene non-local spin valve devices
- Graphene Spin Transistor
- Graphene with Structure-Induced Spin-Orbit Coupling: Spin-Polarized States, Spin Zero Modes, and Quantum Hall Effect
- Quantum Anomalous Hall Effect in Single-layer and Bilayer Graphene
- Long Distance Spin Transport in High Mobility Graphene on Hexagonal Boron Nitride
- Anisotropic spin relaxation in graphene
- Spin relaxation mechanism in graphene: resonant scattering by magnetic impurities
- Spin-dependent transport through a chiral molecule in the presence of spin-orbit interaction and non-unitary effects
- Pseudospin-driven spin relaxation mechanism in graphene
- Non-Abelian gauge field theory of the spin-orbit interaction and a perfect spin filter
- Chiral tunneling in single and bilayer graphene
- Spin-resolved scattering through spin-orbit nanostructures in graphene
- Single-layer and bilayer graphene superlattices: collimation, additional Dirac points and Dirac lines
- Dynamically-generated pure spin current in single-layer graphene
- Spin-dependent Klein tunneling in graphene: Role of Rashba spin-orbit coupling
- 98% directional guiding of spin currents with 90 micrometer relaxation length in bilayer graphene using carrier drift
- Dynamic Spin Injection into Chemical Vapor Deposited Graphene
- A gate-variable spin current demultiplexer based on graphene
- Electronic Spin Transport in Dual-Gated Bilayer Graphene
- Rashba spin-orbit interaction in graphene armchair nanoribbons
- Upstanding Rashba spin in honeycomb lattices: Electrically reversible surface spin polarization
- Rashba spin-orbit interaction enhanced by graphene in-plane deformations
- Simple spin-orbit based devices for electron spin polarization
- Klein Bound States in Single-Layer Graphene