Dynamical Spin-Orbit-Based Spin Transistor

Abstract

Spin-orbit interaction (SOI) has been a key tool to steer and manipulate spin-dependent transport properties in two-dimensional electron gases. Here we demonstrate how spin currents can be created and efficiently read out in nano- or mesoscale conductors with time-dependent and spatially inhomogeneous Rashba SOI. Invoking an underlying non-Abelian SU(2) gauge structure we show how time-periodic spin-orbit fields give rise to spin electric forces and enable the generation of pure spin currents of the order of several hundred nano-Amperes. In a complementary way, by combining gauge transformations with "hidden" Onsager relations, we exploit spatially inhomogeneous Rashba SOI to convert spin currents (back) into charge currents. In combining both concepts, we devise a spin transistor that integrates efficient spin current generation, by employing dynamical SOI, with its experimentally feasible detection via conversion into charge signals. We derive general expressions for the respective spin- and charge conductance, covering large parameter regimes of SOI strength and driving frequencies, far beyond usual adiabatic approaches such as the frozen scattering matrix approximation. We check our analytical expressions and approximations with full numerical spin-dependent transport simulations and demonstrate that the predictions hold true in a wide range from low to high driving frequencies.

arXiv comment24 pages, 9 figures

References in corpus (34)

• Spintronics: Fundamentals and applications
• Nonlocal magnetization dynamics in ferromagnetic heterostructures
• Kwant: a software package for quantum transport
• Scattering approach to parametric pumping
• Floquet scattering theory of quantum pumps
• Spin-orbit coupling effects on quantum transport in lateral semiconductor dots
• Scattering Theory of Photon-Assisted Electron Transport
• Electron Transport Driven by Nonequilibrium Magnetic Textures
• Equilibrium spin currents: Non-Abelian gauge invariance and color diamagnetism in condensed matter
• Mono-parametric quantum charge pumping: interplay between spatial interference and photon-assisted tunneling
• Pumping spin with electrical fields
• Mesoscopic Spin Hall Effect in Multiprobe Ballistic Spin-Orbit Coupled Semiconductor Bridges
• Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
• Spin Current Generation and Detection in the Presence of AC Gate
• Mesoscopic Stern-Gerlach spin filter by nonuniform spin-orbit interaction
• Non-Abelian gauge fields in the gradient expansion: generalized Boltzmann and Eilenberger equations
• Mesoscopic effects in adiabatic spin pumping
• Weak localization and conductance fluctuations of a chaotic quantum dot with tunable spin-orbit coupling
• Generation of spin current and polarization under dynamic gate control of spin-orbit interaction in low-dimensional semiconductor systems
• Floquet spin states in graphene under ac driven spin-orbit interaction
• Detection of current-induced spins by ferromagnetic contacts
• Onsager relations in a two-dimensional electron gas with spin-orbit coupling
• Spatio-temporal dynamics of shift current quantum pumping by femtosecond light pulse
• High-harmonic generation in spin-orbit coupled systems
• Pure spin current generation in a Rashba-Dresselhaus quantum channel
• Purely electric spin pumping in one-dimension
• Spin-polarized tunable photocurrents
• Extracting current-induced spins: spin boundary conditions at narrow Hall contacts
• Two-dimensional quantum rings with oscillating spin-orbit interaction strength: A wave function picture
• Electrical probing of the spin conductance of mesoscopic cavities
• Spin transistor action from Onsager reciprocity and SU(2) gauge theory
• DC spin generation by junctions with AC driven spin-orbit interaction
• Gauge transformations of Spin-Orbit interactions in graphene
• Spin-orbit pumping