Photo-induced, non-equilibrium spin and charge polarization in quantum rings
arXiv:0806.0317 · doi:10.1103/PhysRevB.77.235438
Abstract
We investigate the spin-dependent dynamical response of a quantum ring with a spin-orbit interaction upon the application of linearly polarized, picosecond, asymmetric electromagnetic pulses. The oscillations of the generated dipole moment are sensitive to the parity of the occupation number in the ring and to the strength of the spin-orbit coupling. It is shown how the associated emission spectrum can be controlled via the pulse strength or a gate voltage. In addition, we inspect how a static magnetic flux can modify the non-equilibrium dynamics. In presence of the spin-orbit interaction and for a paramagnetic ring, the applied pulse results in a spin-split, non-equilibrium local charge density. The resulting temporal spin polarization is directed perpendicular to the light-pulse polarization axis and oscillates periodically with the frequency of the spin-split charge density. The spin-averaged non-equilibrium charge density possesses a left-right symmetry with respect to the pulse polarization axis. The calculations presented here are applicable to nano-meter rings fabricated in heterojuctions of III-V and II-VI semiconductors containing several hundreds electrons.
24 pages, 8 figures. accepted for publication in Phys. Rev. B
References in corpus (19)
- Spectroscopy of nanoscopic semiconductor rings
- Energy spectra of quantum rings
- Spin interference effects in ring conductors subject to Rashba coupling
- Spin-dependent (magneto)transport through a ring due to spin-orbit interaction
- Direct observation of the Aharonov-Casher phase
- Persistent current in ballistic mesoscopic rings with Rashba spin-orbit coupling
- Quantum rings as electron spin beam splitters
- Observation of Persistent Currents in Mesoscopic Connected Rings
- Spin states and persistent currents in mesoscopic rings: spin-orbit interactions
- Spintronic single qubit gate based on a quantum ring with spin-orbit interaction
- Laser-controlled local magnetic field with semiconductor quantum rings
- Non-adiabatic current generation in a finite width semiconductor ring
- Revivals, collapses and magnetic-pulse generation in quantum rings
- Floquet states and persistent currents transitions in a mesoscopic ring
- Net current generation in a 1D quantum ring at zero magnetic field
- Aharonov-Bohm magnetization of mesoscopic rings caused by inelastic relaxation
- Nonequilibrium charge dynamics of light-driven rings threaded by a magnetic flux
- Non-linear response and electron-electron interactions in mesoscopic metal rings
- Non-adiabatic Current Excitation in Quantum Rings
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- Geometry and linearly polarized cavity photon effects on the charge and spin currents of spin-orbit interacting electrons in a quantum ring
- Fast optical control of spin dynamics in a quantum wire
- All-Optical Generation and Tuning of Ultrafast Spin-Hall Current via Optical Vortices
- Electromagnetic Pulse Driven Spin-dependent Currents in Semiconductor Quantum Rings