Journal
PHYSICAL REVIEW LETTERS
Volume 121, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.116101
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Funding
- JSPS KAKENHI [JP15H06127, JP17K19024, JP18H01807, JP18H03859]
- Hattori Hokokai Foundation
- Toray Science Foundation
- Asahi Glass Foundation
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We demonstrated that a nitric oxide (NO) molecule on Cu(110) acts as an ON-OFF-ON toggle switch that can be turned on and off by repulsive force and electron injection, respectively. On the surface, NO molecules exist in three configurations: flat along the [001] direction (ON), upright (OFF), and flat along [00 (1) over bar] (ON). An NO-functionalized tip, which was characterized by scanning tunneling microscopy and inelastic electron tunneling spectroscopy, can convert an upright NO adsorbate into a flat-lying NO. Atomic force microscopy and a simulation of the interactions between the NO molecules reveal that a repulsive force not aligned with the N-O bond provides the torque that detrudes the NO toggle; i.e., the upright NO adsorbate is tilted away from the tip. Therefore, the NO adsorbate behaves as a nonvolatile sensor for the detection of locally applied repulsive torque.
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