AI Article Synopsis
- Scanning tunneling microscopy at low temperatures shows that atoms on a semiconductor surface can switch between two heights when a nearby nanostructure is present.
- The STM tip influences these atoms, changing their charge states and allowing for potential multiple switching behaviors.
- Theoretical models, including density-functional theory and a lattice-gas model, help explain the observed phenomena and predict the atoms' cooperative behavior.
Article Abstract
Scanning tunneling microscopy (STM) at 5 K reveals that native atoms in the surface layer of a semiconductor crystal become bistable in vertical height when a nanostructure is assembled nearby. The binary switching of surface atoms, driven by the STM tip, changes their charge state. Coupling is facilitated by assembling adatom chains, allowing us to explore the emergence of complex multiple switching. Density-functional theory calculations rationalize the observations and a lattice-gas model predicts the cooperative behavior from first principles.
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| http://dx.doi.org/10.1021/nl2009444 | DOI Listing |
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