Ultrafast and gigantic spin injection in semiconductors

Abstract

The injection of spin currents in semiconductors is one of the big challenges of spintronics. Motivated by the ultrafast demagnetisation and spin injection into metals, we propose an alternative femtosecond route based on the laser excitation of superdiffusive spin currents in a ferromagnet such as Ni. Our calculations show that even though only a fraction of the current crosses the Ni-Si interface, the laser-induced creation of strong transient electrical fields at a ferromagnet-semiconductor interface allows for the injection of chargeless spin currents with a record spin polarisations of 80%. Beyond that they are pulsed on the time scale of 100 femtoseconds which opens the door for new experiments and ultrafast spintronics.

References in corpus (2)

• Super-Diffusive Spin-Transport as a Mechanism of Ultrafast Demagnetization
• Electronic measurement and control of spin transport in Silicon

Cited by in corpus (17)

• Spintronic Sources of Ultrashort Terahertz Electromagnetic Pulses
• Modification of spintronic terahertz emitter performance through defect engineering
• Particle-in-cell simulation of ultrafast hot-carrier transport in Fe/Au-heterostructures
• Analysis of the linear relationship between asymmetry and magnetic moment at the M-edge of 3d transition metals
• Laser-induced persistent photovoltage on the surface of a ternary topological insulator at room temperature
• Dynamic spin injection into a quantum well coupled to a spin-split bound state
• Element-resolved ultrafast demagnetization rates in ferrimagnetic CoDy
• Micromagnetic view on ultrafast magnon generation by femtosecond spin current pulses
• Transfer Matrix description of heterostructured spintronics Terahertz emission
• Distinctive Picosecond Spin Polarization Dynamics in Bulk Half-Metals
• Impact of ultrafast transport on the high-energy states of a photoexcited topological insulator
• Modelling of Spintronic Terahertz Emitters as a function of spin generation and diffusion geometry
• Numerical solver for the time-dependent far-from-equilibrium Boltzmann equation
• Spin polarisation of ultrashort spin current pulses injected in semiconductors
• Numerical scheme for the far-out-of-equilibrium time-dependent Boltzmann collision operator: 1D second-degree momentum discretisation and adaptive time stepping
• Spatio-Temporal Electron Propagation Dynamics in Au/Fe/MgO(001) in nonequilibrium: Revealing Single Scattering Events and the Ballistic Limit
• Numerical Solver for the out-of-equilibrium time dependent Boltzmann Collision operator: Application to 2D materials