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Related Experiment Video

Updated: Nov 26, 2025

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Published on: August 2, 2019

Highly nonlinear transport across single-molecule junctions via destructive quantum interference.

Julia E Greenwald¹, Joseph Cameron², Neil J Findlay²

¹Department of Chemistry, Columbia University, New York, NY, USA.

Nature Nanotechnology

|December 8, 2020

Summary

This summary is machine-generated.

Researchers developed a new molecular system for highly nonlinear single-molecule circuits. This design enhances destructive quantum interference, enabling a 10,000-fold modulation of conductance in a 6-nm molecule.

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Area of Science:

Molecular electronics
Quantum interference in molecular systems

Background:

Single-molecule devices require nonlinear current-voltage (I-V) characteristics to match integrated circuits.
Current methods often rely on destructive quantum interference (QI) between frontier molecular orbitals, which is difficult to tune.

Purpose of the Study:

To design a molecular system with enhanced nonlinear I-V characteristics.
To explore an alternative QI strategy for molecular electronics.

Main Methods:

Utilized fluorene oligomers with a central benzothiadiazole unit.
Engineered constructive QI suppression and enhanced destructive QI between specific molecular orbitals.

Main Results:

Demonstrated highly nonlinear single-molecule circuits using the designed molecular system.
Achieved reproducible conductance modulation exceeding 10^4 in a 6-nm molecule.

Conclusions:

The proposed strategy effectively creates highly nonlinear molecular circuits.
This approach offers a controllable method for tuning molecular conductance.