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Updated: Dec 5, 2025
Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots
Published on: November 1, 2013
Zwitterionic Mixed-Valence Species for the Design of Neutral Clocked Molecular Quantum-Dot Cellular Automata
Thomas Groizard1, Samia Kahlal1, Jean-François Halet1
1Univ Rennes, CNRS, Institut des Sciences Chimiques de Rennes (ISCR) - UMR 6226, F-35000 Rennes, France.
Abstract:
Mixed-valence compounds can be used for the design of molecular quantum-dot cellular automata (QCA). Here, we investigate the QCA properties of a three-dot "Y"-shaped functionalized zwitterionic neutral closo-carborane model 1-(3,5-{Cp(dHpe)Fe-C≡C-}2(C6H3))-10-Cp(dHpe)Fe-C≡C-closo-1-CB9H8 (1) (Cp = cyclopentadienyl (η5-C5H5) and dHpe = 1,2-bis(phosphino)ethane (H2PCH2CH2PH2)) as a neutral clocked molecular half-cell. DFT results clearly demonstrate that 1 can display simultaneously the two most basic properties necessary for clocked QCA operation, i.e., bistable switching behavior and clocked control. This is possible due to the three stable states (two active and one null) of 1, corresponding to occupation of each of the three iron-ethynyl groups by the positive charge. In addition, the proximal electronic bias effects can be overcome by the zwitterionic nature of 1, which could be imposed by external counterions, rendering these effects more predictable.
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