Science, Space and Technology News 2024
Michigan State University combined terahertz laser light, shown as a red wavy arrow, with a scanning tunneling microscope, or STM, tip — the dark pyramid shape exchanging a red electron with a sample shown with a blue surface.
Defects play a big part in that electron motion, which is why scientists like Cocker are keen to learn precisely where they are located and how they behave. Cocker’s peers have been excited to learn that his team’s new technique will let them easily obtain that information.Vedran Jelic, who spearheaded the project as a postdoctoral researcher in Cocker’s group and is now with the National Research Council Canada, is the new report’s first author.
Unlike the microscopes many folks would recognize from high school science classes, STMs don’t use lenses and light bulbs to magnify objects. Rather, STMs scan a sample’s surface using an atomically sharp tip, almost like the stylus on a record player. For their latest publication, Cocker and his team focused on gallium arsenide samples that were intentionally infused with silicon defect atoms to tune how electrons move through the semiconductor.“The silicon atom basically looks like a deep pothole to the electrons,” Cocker said.
By coupling STM and terahertz light, the MSU team created a probe that has an unparalleled sensitivity for the defects.
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