| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior Related to Interface Physics IV
|
| Presentation Title |
Quantifying superlubricity of heterostrained bilayer graphene from the mobility of interface dislocations |
| Author(s) |
Md Tusher Ahmed, Harley T Johnson, Nikhil Chandra Admal, Moon-ki Choi |
| On-Site Speaker (Planned) |
Md Tusher Ahmed |
| Abstract Scope |
Superlubricity, characterized by negligible interfacial sliding resistance, is a fascinating property observed in slightly misaligned Van der Waals 2D interfaces. This phenomenon, observed in twisted bilayer graphene (BG), arises from structural reconstruction mediated by interface dislocations. Although numerous studies have been conducted to quantify the frictional behavior of heterostrained BG, the impact of individual screw and edge dislocation mobilities on the frictional properties of heterostrained BG remains unexplored. In this study, we aim for a quantitative characterization of superlubricity from the kinetic properties of individual interface dislocations.
We begin by characterizing the mobility of individual dislocations using Molecular Dynamics simulations under various loads and temperatures. The computed mobilities are incorporated into a recently developed bicrystallography-informed Frenkel--Kontorova model for efficient prediction of the friction property of bilayer graphene as a function of twist angle and strain. This model offers a robust framework for understanding the dynamics of misaligned BG. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Thin Films and Interfaces, Modeling and Simulation |