All-optical generation and detection of sub-picosecond ac spin current pulses in GaAs

Details All-optical generation and detection of sub-picosecond ac spin current pulses in GaAs All-optical generation and detection of sub-picosecond ac spin current pulses in GaAs

2008-06-24

arxiv.org/abs/0806.3901v1

Phys. Rev. B 78, 045314 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.78.045314

Sub-picosecond ac spin current pulses are generated optically in GaAs bulk and quantum wells at room temperature and 90K through quantum interference between one-photon and two-photon absorptions driven by two phase-locked ultrafast laser pulses that are both circularly polarized. The dynamics of the current pulses are detected optically by monitoring in real time and real space nanoscale motion of electrons with high-resolution pump-probe techniques.

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