Controlling quantum transport through a single molecule

TL;DR

This paper proposes a novel quantum interference transistor using single aromatic molecules, controlling electron flow via symmetry-breaking mechanisms to address power and environmental issues in nanoscale devices.

Contribution

It introduces the Quantum Interference Effect Transistor (QuIET), leveraging molecular symmetry and decoherence to control quantum transport.

Findings

Demonstrates control of current through molecular symmetry manipulation

Shows potential for low power dissipation in nanoscale devices

Proposes a new device concept based on quantum interference

Abstract

We investigate multi-terminal quantum transport through single monocyclic aromatic annulene molecules, and their derivatives, using the nonequilibrium Green function approach in the self-consistent Hartree-Fock approximation. A new device concept, the Quantum Interference Effect Transistor (QuIET) is proposed, exploiting perfect destructive interference stemming from molecular symmetry, and controlling current flow by introducing decoherence and/or elastic scattering that break the symmetry. This approach overcomes the fundamental problems of power dissipation and environmental sensitivity that beset many nanoscale device proposals.