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Quantum Transport in Nanoscale Systems
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Our group is interested in the nanometer-scale transport properties
(charge, energy, spin, ...) of molecular and super-molecular
systems. These systems are of rising interest both from the
technological (possible future nanoelectronics!) and fundamental
points of view. In order to study the electronic properties, we must
first connect nanometer size objects to the outside world. To this
end we use a variety of nanofabrication techniques including optical
lithography, electron beam lithography, thin film deposition and
etching approaches. Much of our work relies on facilities in the
University of Pennsylvania
Micro/NanoFabrication Laboratory. Once we have a molecular
circuit, we measure its properties using a variety of techniques
including: low-temperature magnetotransport, thermal conductivity
measurement, and hybrid scanning probe techniques that let us
measure local electronic properties with nanometer-scale
resolution. |
Johnson Group
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From left to right: Charlie Johnson, Yaping Dan, Alex
Fried, Danvers Johnston, Sujit Datta, Doug Strachan, Michelle Chen,
Luke Somers, Mary Dratman, Bob Johnson, Sam Khamis, Kumhyo Byon |
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Selected
Recent Publications
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Parallel Fabrication of Nanogap Electrodes
D.E. Johnston, D.R. Strachan, and A.T. Johnson, Nano Lett. 7,
2774-2777 (2007)
Reference to this
article has appeared in a recent issue of
Nanomaterials News
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DNA-decorated
carbon nanotubes for chemical sensing
C. Staii, M. Chen, A. Gelperin, and A.T. Johnson.
Nano Lett. 5, 1774-1778 (2005)
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Controlled fabrication of nanogaps in ambient environment for
molecular electronics
D. R. Strachan,
D. E. Smith, D. E. Johnston, T.-H. Park, Michael J. Therien,
D. A. Bonnell, and A. T. Johnson. Applied Physics Letters 86,
043109 (2005)
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Electronic devices based on purified carbon nanotubes grown by
high pressure decomposition of carbon monoxide
Danvers E. Johnston, Mohammad F.
Islam, Arjun G. Yodh, and A.T. Johnson. Nature Materials 4, 589 –
592 (2005).
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