Double Gated Single Molecular Transistor for Charge Detection

Abstract

The electrostatic behaviour of an 1,3-Cyclobutadiene (C${}_4$H${}_4$) based Single Molecular Transistor (SMT) has been investigated using the first principle calculation based on Density functional Theory and non-equilibrium Green's function approach. While the molecule is placed on top of a dielectric layer (backed by a metallic gate) and weakly coupled between the Source/Drain electrodes, the charge stability diagram revealed the presence of individual charge states in the Coulomb Blockade regime. This gets affected significantly on addition of an another gate electrode placed on the top of the molecule. This modified double-gated geometry allows additional control of the total energy of the system that is sensitive to the individual charge states of the molecule which can be used as a charge sensing technique operational at room temperature.

7 pages, 4 figures

References in corpus (4)

• Density functional method for nonequilibrium electron transport
• Electronic excitations of a single molecule contacted in a three-terminal configuration
• Strong polarization-induced reduction of addition energies in single-molecule nanojunctions
• First-principles modelling of molecular single-electron transistors

Cited by in corpus (5)

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• Exact diagonalization study of double quantum dots in parallel geometry in zero-bandwidth limit