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UID:DSC-1049
DTSTART;TZID=Europe/Berlin:20110127T103000
SEQUENCE:1306507061
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20110127T120000
URL:https://dresden-science-calendar.de/calendar/en/detail/1049
LOCATION:HZDR\, Bautzner Landstraße 40001328 Dresden
SUMMARY:Beschoten: FWI Institutskolloquium: Time-resolved transport of elec
 tron spins in nanostructures
CLASS:PUBLIC
DESCRIPTION:Speaker: Dr. Bernd Beschoten\, RWTH Aachen\, Physikalisches Ins
 titut\nInstitute of Speaker: \nTopics:\nPhysik\n Location:\n  Name: HZDR (
 6/255 - Hörsaal)\n  Street: Bautzner Landstraße 400\n  City: 01328 Dresd
 en\n  Phone: \n  Fax: \nDescription: The precise phase control of spins in
  semiconductor spintronic devices requires electrical means for generating
  spin packets with a well-defined initial phase. So far\, ultrafast laser 
 pulses have successfully been used to trigger the ensemble phase of optica
 lly generated spin packets. However\, electrical methods for ensemble phas
 e triggering remain challenging. Here\, we use fast current pulses to elec
 trically inject phase triggered spin packets across an Fe/GaAs Schottky ba
 rrier into n-GaAs. We demonstrate phase coherence by the observation of mu
 ltiple Larmor precession cycles for current pulse widths down to 500 ps at
  20 K. We show that the current pulses are broadened by the charging and d
 ischarging time of the Schottky barrier. At high frequencies\, the observa
 ble spin coherence is limited only by the finite band width of the current
  pulses\, which is on the order of 2 GHz. These results therefore demonstr
 ate that all-electrical injection and phase control of spin packets at mic
 rowave frequencies is possible in ferromagnet/semiconductor heterostructur
 es.
DTSTAMP:20260627T160702Z
CREATED:20110527T143741Z
LAST-MODIFIED:20110527T143741Z
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