Non-adiabatic generation of a pure spin current in a 1D quantum ring with spin-orbit interaction

Abstract

We demonstrate the theoretical possibility of obtaining a pure spin current in a 1D ring with spin-orbit interaction by irradiation with a non-adiabatic, two-component terahertz laser pulse, whose spatial asymmetry is reflected by an internal dephasing angle $\varphi$. The stationary solutions of the equation of motion for the density operator are obtained for a spin-orbit coupling linear in the electron momentum (Rashba) and used to calculate the time-dependent charge and spin currents. We find that there are critical values of $\varphi$ at which the charge current disappears, while the spin current reaches a maximum or a minimum value.

8 pages, 5 figures

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• Persistent current in ballistic mesoscopic rings with Rashba spin-orbit coupling
• Spin states and persistent currents in mesoscopic rings: spin-orbit interactions
• Modulating Unpolarized Current in Quantum Spintronics: Visibility of Spin-Interference Effects in Multichannel Aharonov-Casher Mesoscopic Rings
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Cited by in corpus (10)

• Electron localization and optical absorption of polygonal quantum rings
• Persistent charge and spin currents in a 1D ring with Rashba and Dresselhaus spin-orbit interactions by excitation with a terahertz pulse
• Charge and spin polarized currents in mesoscopic rings with Rashba spin-orbit interactions coupled to an electron reservoir
• Excitation spectra of a quantum ring embedded in a photon cavity
• Geometry and linearly polarized cavity photon effects on the charge and spin currents of spin-orbit interacting electrons in a quantum ring
• Spin Magnetic Moment and Persistent Orbital Currents in Cylindrical Nanolayer
• Impact of a circularly polarized cavity photon field on the charge and spin flow through an Aharonov-Casher ring
• Oscillating spin-orbit interaction as a source of spin-polarized wave packets in two-terminal nanoscale devices
• Nonadiabatic generation of spin currents in a quantum ring with Rashba and Dresselhaus spin-orbit interactions
• Boundary Conditions and Formation of Pure Spin Currents in Magnetic Field