Revivals, collapses and magnetic-pulse generation in quantum rings

Details Revivals, collapses and magnetic-pulse generation in quantum rings Revivals, collapses and magnetic-pulse generation in quantum rings

2006-08-25

arxiv.org/abs/cond-mat/0608559v1

Phys. Rev. B 74, 161303 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevB.74.161303

Using a microscopic theory based on the density matrix formalism we investigate quantum revivals and collapses of the charge polarization and charge current dynamics in mesoscopic rings driven by short asymmetric electromagnetic pulses. The collapsed state is utilized for sub-picosecond switching of the current and associated magnetization, enabling thus the generation of pulsed magnetic fields with a tunable time structure and shape asymmetry which provides a new tool to study ultrafast spin-dynamics and ratchet-based effects.

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