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SUMMARY:Electron Spin Injection and Transport in Semiconductors - Dr Darry
 l L. Smith\, Los Alamos National Laboratory
DTSTART:20061026T131500Z
DTEND:20061026T141500Z
UID:TALK5239@talks.cam.ac.uk
CONTACT:Peter Haynes
DESCRIPTION:Spin polarized electron distributions can be generated in nonm
 agnetic semiconductors optically and by electrical injection from ferromag
 netic contacts.  Optical spin generation relays on optical selection rules
  that result from the spin-orbit interaction. Electrical spin injection re
 quires that the semiconductor be driven\nout of local equilibrium by a spi
 n-polarized current flowing from the ferromagnetic contact. In inorganic s
 emiconductors\, such as GaAs\, both optical and electrical spin injection 
 have been demonstrated and the transport properties of the spin polarized 
 electron distribution have been probed using Kerr microscopy.  The spin-or
 bit interaction\, which enables the optical probes of electron spin distri
 butions in inorganic semiconductors\, is often weak in organic semiconduct
 ors. I will describe our work on optical and electrical spin injection\, a
 nd spin transport in inorganic semiconductors\; contrast the consideration
 s for spin generation and detection in organic and inorganic semiconductor
 s\; and describe our efforts to include metal-organic molecules into conju
 gated polymer hosts to produce organic semiconductors with a significant s
 pin-orbit interaction.
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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