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SUMMARY:The 0.5 plateau - Dr. Rolf Crook (Semiconductor Physics Group\, Ca
 vendish Laboratory)
DTSTART:20061016T131500Z
DTEND:20061016T141500Z
UID:TALK5655@talks.cam.ac.uk
CONTACT:K DAS GUPTA
DESCRIPTION:Structure in 1D conductance below 2e^2^/h is of particular int
 erest\nto researchers because new electron interaction effects may be domi
 nant and\nbecause theory is incomplete. The 0.7 structure and the related 
 0.7 analog\nhave been the focus of research. But there is another feature 
 - the 0.5\nplateau (at B=0). Although the 0.5 plateau has been reported se
 veral times\nin the past\, it never received much attention perhaps becaus
 e it is somewhat\nenigmatic. I'll describe data from an induced GaAs quant
 um wire which\nexhibits a clear additional conductance plateau at 0.5*2e^2
 ^/h in zero\nmagnetic field. The plateau was most pronounced when the pote
 ntial landscape\nwas tuned to be symmetric using low-temperature scanning-
 probe techniques.\nSource-drain energy-spectroscopy and temperature respon
 se support the\nhypothesis that the origin of the plateau is the spontaneo
 us\nspin-polarization of the transport electrons - a ferromagnetic phase. 
 Such\ndevices may have applications in the field of spintronics\, to eithe
 r\ngenerate or detect a spin polarized current without the complications\n
 associated with external magnetic fields or magnetic materials.\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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