Long starphene single molecule NOR Boolean logic gate

W. H. Soe*, C. Manzano, P. de Mendoza, P. R. McGonigal, A. M. Echavarren, C. Joachim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Using a low temperature scanning tunneling microscope (LT-UHV-STM), local electronic tunneling spectroscopy and differential conductance mapping are performed to investigate how by extending one phenyl more each branch of the conjugated board of a trinaphthylene starphene molecule, the corresponding longer trianthracene starphene new molecule is functioning like a NOR Boolean logic gate according to a Quantum Hamiltonian Computing (QHC) design. Here the STM tip is used to manipulate single Au atoms one at a time for contacting a trianthracene molecule. Each Au atom is acting like a classical digital input on the molecule encoding for a logical “0” when the atom is not interacting with the trianthracene input branch and for a logical “1” when interacting. The inputs are converted in quantum information inside the trianthracene molecule and the logical output status available on the output branch. QHC is demonstrated to be robust since quantum information transfer can be used on the long range along the trianthracene for the NOR logic gate to function properly as compared to the shorter trinaphthylene molecule.

Original languageEnglish
Pages (from-to)163-168
Number of pages6
JournalSurface Science
Publication statusPublished - Dec 2018

Bibliographical note

Funding Information:
We acknowledge financial support from Singapore's Agency of Science, Technology and Research (A*STAR) for the Visiting Investigatorship Program (Phase III): AtomTech Project, the AtMol European Commission integrated project and the WPI MANA-NIMS program.

Publisher Copyright:
© 2018 Elsevier B.V.


  • Logical Operation
  • Molecular electronics
  • Single molecule computing
  • STM

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