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Updated: May 12, 2025
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
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Disentangling Morphology and Conductance in Amorphous Graphene.
Nicolas Gastellu1, Ata Madanchi2, Lena Simine1,2
1Department of Chemistry, McGill University, Montréal, Québec H3A 0C7, Canada.
The Journal of Physical Chemistry Letters
|April 29, 2025
Summary
Amorphous monolayer carbon (AMC) films show electronic conductance highly dependent on their structure. Deep learning simulations reveal how morphology and crystallinity influence conductivity, offering potential for gate voltage control.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Chemistry
Background:
- Amorphous monolayer carbon (AMC) films exhibit morphology-dependent electronic conductance.
- Understanding this relationship is crucial for designing novel carbon-based electronic materials.
- Traditional methods face challenges with the aperiodic nature of AMC.
Purpose of the Study:
- To analyze the electronic conductance of morphologically distinct AMCs.
- To investigate the interplay between morphology, crystallinity, and conductance.
- To explore methods for controlling AMC conductivity.
Main Methods:
- Utilized deep learning-enhanced simulations combined with percolation theory.
- Analyzed three distinct mesoscale AMC morphologies.
- Avoided periodic boundary conditions and simplified assumptions about conducting sites.
Main Results:
- Successfully reproduced the known dependence of charge conductance on AMC morphology.
- Identified limitations of partial morphology descriptors in predicting conductance.
- Demonstrated that conductance networks shift from crystallites at band edges to defects near the Fermi energy.
Conclusions:
- AMC electronic properties are intricately linked to their complex, aperiodic morphology.
- Deep learning simulations provide a robust framework for studying these systems.
- The observed shift in localization offers a pathway for gate voltage-based control of AMC conductivity.
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