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Electric-Field-Tunable Edge Transport in Bernal-Stacked Trilayer Graphene
Saurabh Kumar Srivastav1, Adithi Udupa2, K Watanabe3
1Department of Physics, Indian Institute of Science, Bangalore 560012, India.
Physical Review Letters
|March 15, 2024
Summary
This study reveals that electric fields significantly enhance edge transport in trilayer graphene, with nonlocal resistance exceeding classical predictions by over 100 times. Edge-mediated charge transport is confirmed, especially at low temperatures and high fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Bernal-stacked (ABA) trilayer graphene is a promising material for electronic devices.
- Understanding edge transport phenomena is crucial for optimizing graphene-based electronics.
- Electric-field tunability offers a pathway to control material properties.
Purpose of the Study:
- To investigate electric-field-tunable edge transport in ABA trilayer graphene.
- To quantify the nonlocal resistance and its dependence on displacement fields and temperature.
- To provide experimental evidence and theoretical support for edge-mediated charge transport.
Main Methods:
- Nonlocal resistance measurements on h-BN-encapsulated dual-gated ABA trilayer graphene.
- Systematic variation of displacement fields (D) and temperatures (T).
- Scaling analysis of nonlocal resistance (R_NL) versus local resistance (R_L) and channel length (L).
- Theoretical calculations to model edge modes.
Main Results:
- Nonlocal resistance (R_NL) was observed to be at least 2 orders of magnitude higher than classical Ohmic contribution.
- R_NL scales linearly with R_L for displacement fields exceeding ~0.2 V/nm.
- A constant scaling exponent of unity was found for temperatures below 25 K.
- R_NL decreases linearly with increasing channel length (L).
Conclusions:
- Experimental findings strongly support edge-mediated charge transport in ABA trilayer graphene.
- A finite displacement field is essential for observing these edge transport phenomena.
- Theoretical calculations confirm the existence of dispersive edge modes under applied electric fields.
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