Monday, November 23, 2009, 10:30 am — Large Conference Room, Bldg. 703
If you would like to meet with the speaker afterwards, please contact the host, enazaretski@bnl.gov prior to this presentation to coordinate a time slot.
Accurate measurement of mechanical and electronic properties at length scales approaching atomic dimensions often requires the ability to measure and control displacement between, for example, a probe tip and a surface with resolution and stability finer than those atomic dimensions. We have developed a new instrument we call a feedback-stabilized break junction (FSBJ) based on a fiber-optic Fabry-Perot interferometer that has been optimized for DC stability. The FSBJ allows us to accurately measure and control the motion of a probe tip relative to a surface with long-term stability better than 10 % of a typical atomic radius. In this talk, I will describe the design and performance of the interferometer system in detail, and will also show how we are using the FSBJ to study the electronic and mechanical properties of gold nanowires and single-atom chains formed between a probe tip and a surface.
Hosted by: Evgueni Nazaretski
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