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SUMMARY:Spin precession control and the Aharonov-Casher effect - Dr Tobias
  Bergsten - SP Group\, Cavendish Laboratory
DTSTART:20070205T141500Z
DTEND:20070205T151500Z
UID:TALK6624@talks.cam.ac.uk
CONTACT:K DAS GUPTA
DESCRIPTION:In this talk I will present some of the results from my work a
 t NTT Basic\nResearch Labs in Japan. We investigated interference effects 
 due to spin\nprecession in InGaAs/InAlAs heterostructures. In our heterost
 ructures\, a 10\nnm InGaAs quantum well served as a two-dimensional electr
 on gas with\nspin-orbit interaction (SOI). We etched arrays of narrow ring
 s\, 1-2\nmicrometres in diameter\, in the 2DEG and covered the rings with 
 an\ninsulating layer and a gate. As a consequence of the SOI\, the electro
 n spins\nprecessed as they travelled around the rings and we could control
  the\nprecession rate by applying a voltage to the gate. We detected inter
 ference\nwhich was due to the spin precession by analysing the\nAl'tshuler
 -Aronov-Spivak interference at different gate voltages. This\ninterference
  is known as the Aharonov-Casher effect.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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