Ultrafast manipulation of electron spins in a double quantum dot device: A real-time view

Abstract

We consider a double quantum dot system with two embedded and non-aligned spin impurities to manipulate the magnitude and polarization of the electron spin density. The device is attached to semi-infinite one-dimensional leads which are treated exactly. We provide a real-time description of the electron spin dynamics when a sequence of ultrafast voltage pulses acts on the device. The numerical simulations are carried out using a spin generalized and modified version of a recently proposed algorithm for the time propagation of open systems [Phys. Rev. B {\bf 72}, 035308 (2005)]. Time-dependent spin accumulations and spin currents are calculated during the entire operating regime which includes spin injection and read-out processes. The full knowledge of the electron dynamics allows us to engineer the transient responses and improve the device performance. An approximate rate equation for the electron spin is also derived and used to discuss the numerical results.

13 pages, 13 eps figures

References in corpus (38)

• Quantum Computation with Quantum Dots
• Spins in few-electron quantum dots
• Time-dependent transport in interacting and non-interacting mesoscopic systems
• Single-shot read-out of an individual electron spin in a quantum dot
• Driven coherent oscillations of a single electron spin in a quantum dot
• Coherent manipulation of electronic states in a double quantum dot
• Zeeman energy and spin relaxation in a one-electron quantum dot
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Time-dependent quantum transport: A practical scheme using density functional theory
• Time-Dependent Partition-Free Approach in Resonant Tunneling Systems
• Conserving GW scheme for nonequilibrium quantum transport in molecular contacts
• Time-dependent density-functional theory for open systems
• Nonequilibrium current driven by a step voltage pulse: an exact solution
• Non-equilibrium GW approach to quantum transport in nano-scale contacts
• Approach to steady state transport in nanoscale conductors
• Non-equilibrium Green's function formalism and the problem of bound states
• Ab initio GW electron-electron interaction effects in Quantum Transport
• Kondo Universal Scaling for a Quantum Dot Coupled to Superconducting Leads
• Conserving Approximations in Time-Dependent Density Functional Theory
• Classical Nuclear Motion in Quantum Transport
• Electronic correlation in nanoscale junctions: Comparison of the GW approximation to a numerically exact solution of the single-impurity Anderson model
• Time-dependent V-representability on lattice systems
• Entanglement Controlled Single-Electron Transmittivity
• Transient regime in non-linear transport through many-level quantum dots
• Quantum Electronic Transport through a Precessing Spin
• Using spin bias to manipulate and measure quantum spin in quantum dots
• On the Mapping of Time-Dependent Densities onto Potentials in Quantum Mechanics
• Aharonov-Bohm oscillations and spin transport in a mesoscopic ring with a magnetic impurity
• Exchange-controlled single-electron-spin rotations in quantum dots
• Electron Fabry-Perot interferometer with two entangled magnetic impurities
• Spin-Dependent Ringing and Beats in a Quantum Dot System
• Equation of motion approach to non-adiabatic quantum charge pumping
• Optoelectronic control of spin dynamics at near-THz frequencies in magnetically doped quantum wells
• Detection of spin reversal and nutations through current measurements
• Entanglement-induced electron coherence in a mesoscopic ring with two magnetic impurities
• Transient Charging and Discharging of Spin-polarized Electrons in a Quantum Dot
• Subnanosecond switching of local spin-exchange coupled to ferromagnets
• Spin-flip Effects in the Mesoscopic Spin-Interferometer

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• Spin-bias driven magnetization reversal and nondestructive detection in a single molecular magnet
• A many-body approach to transport in quantum systems: From the transient regime to the stationary state
• Transport through correlated systems with density functional theory
• Time-linear quantum transport simulations with correlated nonequilibrium Green's functions
• Time-dependent Andreev bound states of a quantum dot coupled to two superconducting leads
• Coherent manipulation of charge qubits in double quantum dots
• Detecting and Switching Magnetization of Stoner Nanograin in Non-local Spin Valve