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Outreach

Princeton Nanoscale Microscopy Laboratory Spintronics at the Atomic-Scale A. Yazdani, Princeton University, DMR-0514522.

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Outreach

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  1. Princeton Nanoscale Microscopy LaboratorySpintronics at the Atomic-ScaleA. Yazdani, Princeton University,DMR-0514522 A novel technique developed by our group uses a scanning tunneling microscope (STM) to substitute magnetic atoms into a semiconductor one atom at a time. This technique has been used to assemble a magnetic semiconductor, manganese-doped gallium arsenide (Ga1-xMnxAs), atom by atom. Interacting pairs of Mn atoms were studied according to their orientation in the crystal and distance apart. The results of this work were recently highlighted in the cover article of the July 27, 2006 issue of Nature. The effort marks a new degree of control over the atomic-level structure of a semiconductor. Manipulating semiconductors could eventually revolutionize computers by exploiting not just the flow of electrons but also their quantum property, called spin, for computation. Our atomic-scale studies of spins in semiconductors are contributing to the exciting field of Spintronics. Nature 442, 436 (2006). Mn acceptors in GaAs magnetically interact through the electronic clouds of the acceptor states. The STM is used to assemble pairs of Mn by crystallographic orientation and spacing (five nearest neighbor pairs are shown). The magnetic interaction strength of the above Mn pairs, shown in the graph, depends strongly on the pair orientation. This work was featured as a cover article in Nature.

  2. Princeton Nanoscale Microscopy LaboratorySpintronics at the Atomic-ScaleA. Yazdani, Princeton University,DMR-0514522 Outreach In addition to the exciting research, our new facility has catered many outreach groups which recently included visits from NJ high school science teachers and from juniors and seniors from the NJ Governor’s high school program. Our group has also provided excellent research opportunities for undergraduate students at Princeton and outside students visiting during the summer. (Above) We describe features of our Variable-Temperature STM during a tour of PNML provided for high school juniors and seniors. (Left) High school juniors and seniors test their cell phone signals in a newly designed RF-shielded room that will become home to an advanced Scanning Tunneling Microscope (supported by NSF-MRI program)

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