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Related Experiment Video

Updated: Jul 20, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Published on: July 24, 2015

Electrostatic Tuning of Bilayer Graphene Edge Modes.

Hira Ali¹, Llorenç Serra^1,2

¹Institute for Cross-Disciplinary Physics and Complex Systems IFISC (CSIC-UIB), E-07122 Palma, Spain.

Nanomaterials (Basel, Switzerland)

|July 29, 2023

Summary

A local potential shift in bilayer graphene creates unprotected edge modes, enabling backscattering. This leads to asymmetric conductance and deviations from quantization in graphene wires.

Keywords:

bilayer graphene edge modes electric transport

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Published on: June 22, 2014

Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Bilayer graphene exhibits unique electronic properties due to its layered structure.
Edge modes in gapped and ungapped regions of bilayer graphene are crucial for device applications.
Understanding the influence of local potentials on these edge modes is essential for controlling electronic transport.

Purpose of the Study:

To investigate the impact of a localized potential shift on edge modes at the boundary of gapped and ungapped bilayer graphene.
To analyze the resulting electronic transport properties, specifically conductance, in bilayer graphene wires subjected to gate-induced potentials.

Main Methods:

Theoretical study of edge modes using a local potential shift induced by a side electrode.
Calculation of conductance in a bilayer graphene wire with applied finger-gate electrodes.
Analysis of edge backscattering and conductance quantization deviations.

Main Results:

A potential shift near the gapped-ungapped boundary induces unprotected edge modes that propagate in both directions.
These counterpropagating edge modes facilitate edge backscattering, differing from conventional valley-momentum-locked modes.
Simulated conductance shows strong energy asymmetries and deviations from quantization, consistent with the presence of unprotected edge modes.

Conclusions:

Local potential engineering offers a method to control edge mode behavior in bilayer graphene.
The emergence of unprotected edge modes explains observed conductance anomalies in gated bilayer graphene wires.
This research provides insights into designing novel electronic devices based on tailored edge states in graphene.