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A wire: Linked-chevron cascade
A linked-chevron cascade in the initial configuration consists of pairs of carbon monoxide (CO) molecules at nearest neighbor sites, plus a trigger molecule. Moving the trigger molecule with a scanning tunneling microscope (STM) tip starts the cascade, which then propagates the "signal" like a wire for an arbitrary length (to the end of the cascade) without further involvement of the STM. Creating the first "chevron" configuration (three CO molecules in a slightly bent arrangement) causes the central CO molecule to tunnel outward to a new position, which sets up the second chevron. By positioning the molecules precisely, each chevron causes a molecule to move, setting up the next chevron and so on as the cascade continues. (Click mouse once to start the PowerPoint.) Click to view PPT
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