Dynamics of fluctuations and thermal buckling in graphene from a phase-field crystal model
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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8
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Physical Review B, Volume 107, issue 3, pp. 1-8
Abstract
We study the effects of thermal fluctuations and pinned boundaries in graphene membranes by using a phase-field crystal model with out-of-plane deformations. For sufficiently long times, the linear diffusive behavior of height fluctuations in systems with free boundaries becomes a saturation regime, while at intermediate times the behavior is still subdiffusive as observed experimentally. Under compression, we find mirror buckling fluctuations where the average height changes from above to below the pinned boundaries, with the average time between fluctuations diverging below a critical temperature corresponding to a thermally induced buckling transition. Near the transition, we find a nonlinear height response in agreement with recent renormalization-group calculations and observed in experiments on graphene membranes under an external transverse force with clamped boundaries.Description
Funding Information: E.G. was supported by the National Council for Scientific and Technological Development-CNPq and computer facilities from CENAPAD-SP. K.R.E. would like to acknowledge support of the National Science Foundation (NSF) under Grant No. DMR-2006456 and Oakland University Technology Services high performance computing facility (Matilda). T.A-N. has been supported in part by the Academy of Finland through its QTF Center of Excellence program Grant No. 312298. Publisher Copyright: © 2023 American Physical Society.
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Granato, E, Elder, K R, Ying, S C & Ala-Nissila, T 2023, 'Dynamics of fluctuations and thermal buckling in graphene from a phase-field crystal model', Physical Review B, vol. 107, no. 3, 035428, pp. 1-8. https://doi.org/10.1103/PhysRevB.107.035428