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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3402
DTSTART:20140811T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260317T092850Z
LAST-MODIFIED:20140905T142821Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Detection and Coherent Control of Rydberg States in Silicon\, 
 R. G. Herb Condensed Matter Seminar\, Dr. Byron Villis\, London Centre
  for Nanotechnology
DESCRIPTION:Over recent years there has been much focus on the QIP pot
 ential of donor atoms in silicon\, including several studies to demons
 trate the measurement of the electron and nuclear spin states of singl
 e donors. However\, to date\, there has only been a small effort to ex
 plore the quantum nature of orbital states (Rydberg states) of donor-b
 ound electrons\; in part this is due to their extremely short lifetime
 s. Nevertheless\, the excited orbital states provide great potential f
 or QIP\, for example controlling the exchange interaction of neighbour
 ing donor atoms. These states are addressable using free space optics 
 and\, unlike the electronic and nuclear spin states\, they are present
  without the application of an external magnetic field. In this presen
 tation I explore the quantum nature and detection mechanisms of the Ry
 dberg states in bulk phosphorus doped wafers as well as lithographical
 ly defined silicon-on-insulator field-effect-transistor devices. The e
 xcitation is done using Fourier transform infrared spectroscopy and te
 rahertz time domain measurements via picosecond free electron laser pu
 lses. The results demonstrate coherent control and ‘detector free’
  measurement of Rydberg state transitions and pave the way to achievin
 g reliable readout of orbital states of single donors.<br><br>
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URL:https://www.physics.wisc.edu/events/?id=3402
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