Special issue article
Scanning tunneling microscopy of oxygen-induced two-state oscillators on Si(111)-7×7
Article first published online: 24 OCT 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Surface and Interface Analysis
Special Issue: Proceedings of the 8th International Symposium on Atomic Level Characterization for New Materials and Devices (ALC 2011), Seoul, Korea, 22–27 May, 2011
Volume 44, Issue 6, pages 666–669, June 2012
How to Cite
Lee, J., Park, J., Jung, W. and Lyo, I.-W. (2012), Scanning tunneling microscopy of oxygen-induced two-state oscillators on Si(111)-7×7. Surf. Interface Anal., 44: 666–669. doi: 10.1002/sia.3845
- Issue published online: 23 MAY 2012
- Article first published online: 24 OCT 2011
- Manuscript Accepted: 22 SEP 2011
- Manuscript Received: 9 SEP 2011
- Scanning tunneling microscopy;
We investigate a novel molecular oscillator that exhibits switching motion at room temperature and above. Scanning tunneling microscopy images show that the structure, produced by dosing oxygen onto a clean Si(111)-7×7, switches between two states expressed by a triad of center adatoms that operate as a stationery site and two alternating hopping sites within a single half-unit cell. Bias-dependent analysis indicates stationery and alternating sites are chemically distinct from each other. The occasional decomposition of the structure shows that it consists of metastable species, whose decay produces typical oxygen-induced chemisorbed states in the aftermath. The origin of such metastable, switching structures is attributed to the strong intermolecular interaction within the triad and with its neighboring sites. Copyright © 2011 John Wiley & Sons, Ltd.