Photo-induced, non-equilibrium spin and charge polarization in quantum rings

Details Photo-induced, non-equilibrium spin and charge polarization in quantum rings Photo-induced, non-equilibrium spin and charge polarization in quantum rings

2008-06-02

arxiv.org/abs/0806.0317v1

Phys. Rev. B 77, 235438 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

24 pages, 8 figures. accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.77.235438

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.

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