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Conductance quantiz...
Conductance quantization histograms of gold nanowires at 4 K
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Costa-Kramer, J.L. (författare)
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Garcia, N. (författare)
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- Olin, Håkan (författare)
- Department of Physics, Chalmers University of Technology and Göteborg University
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(creator_code:org_t)
- 1997
- 1997
- Engelska.
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Ingår i: Physical Review B Condensed Matter. - 0163-1829 .- 1095-3795. ; 55:19, s. 12910-12913
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.1...
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Abstract
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- Driving a scanning tunneling microscope (STM) tip into a metallic surface and pulling it out afterwards results in the formation of a nanometer-sized wire (nanowire) between the electrodes. The electrical conduction measured during this process shows signs of quantized conductance in units of G0=2e2/h. Due to the inherent irreproducibility of the measured conductance curves, the standard technique has been to construct histograms with a few hundred selected curves. These histograms, for gold nanowires at room temperature, have shown three to four peaks at integer values of 2e2/h, while in a low-temperature mechanically controlled break junction study, with statistics using only 65 curves, only the first peak has been reported. A proposed explanation for this apparent experimental discrepancy has been a higher nanowire temperature arising from the higher retraction speed used in scanning tunneling microscopy measurements. However, our simple estimation using macroscopic heat transport theory produces a very low temperature rise, less than 1 μK. In this work, an improved statistical study is presented, where histograms built with thousands of consecutive gold contact breakage experiments at 4 K show up to seven conductance peaks. Thus, no significant differences with our previous room-temperature (RT) studies are observed, pointing to a conductance quantization behavior that is the same at low, intermediate, and high (RT) temperatures.
Nyckelord
- Nanoscience nanotechnology STM nanowires
- NATURAL SCIENCES
- NATURVETENSKAP
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