Fast optical control of spin dynamics in a quantum wire

Details Fast optical control of spin dynamics in a quantum wire Fast optical control of spin dynamics in a quantum wire

2010-09-24

arxiv.org/abs/1009.4819v2

Phys. Rev. B 82, 235304 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 3 figures

Scientific paper

The spin dynamics in a quantum wire with a Rashba spin orbit interaction (SOI) is shown to be controllable via sub-picosecond electromagnetic pulses shaped appropriately. If the light polarization vector is along the wire's direction, the carriers experience a momentum boost while the phase coherence in different spin channels is maintained, a fact exploitable to control the speed of a photo-driven spin field effect transistor. A photon pulse with a polarization vector perpendicular to the wire results in a spin precession which is comparable to that due to the Rashba SOI and is tunable by the pulse field parameters, an effect utilizable in optically controlled spintronics devices.

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