Absence of Even-Odd Effect in Kondo Resonance in Single-Molecule Transistors

ORAL

Abstract

We have observed the Kondo effect in single-electron transistors incorporating individual cyclo[$n$]pyrrole molecules. In contrast to the usual spin-1/2 Kondo effect, the zero-bias Kondo resonance in these devices appears for both even and odd number of electrons. We suggest a model in which instead of alternate spin filling, two successive electrons are added to the molecule with parallel spins due to strong exchange interaction within the molecule.

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Authors

  • Dong-Hun Chae

  • Zhen Yao

    • Department of Physics, The University of Texas at Austin, Austin, TX 78712
    • Department of Physics, University of Texas at Austin

  • Jeong T. Lee

  • Jonathan L. Sessler

    • Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, TX78712