Lam, Leo S. I., Lee, Chun-Shing, Deng, Haiyao  ORCID: https://orcid.org/0000-0001-6065-483X, Zhai, Qiang, Tang, Yunyi, Yip, Cho-Tung, Ruan, Haihui, Fung, Man-Kin and Lam, Chi-Hang
2026.
Mobile-group dominated dynamics and sequence of mobility transitions in facilitated random walk model of glass.
Soft Matter
10.1039/d6sm00435k
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Abstract
Glassy dynamics has been a topic of ongoing debate for decades. We investigate a recently proposed facilitated random walk (FRW) model, which is a kinetically constrained model (KCM) with random constraints and is a coarse-grained version of the distinguishable-particle lattice model (DPLM) of glass. Dynamics in the FRW model with a finite density of particles are dominated by mobile groups of particles enjoying emergent facilitated dynamics. We observe a diffusion coefficient power-law with respect to the particle density, with the exponent identified as the dominant mobile group size. In addition, simplified FRW systems initiated with a few particles at the same site exhibit a sequence of mobility transitions, explaining the dynamical dominance of mobile groups. For such systems with two particles, the mobility transition point is calculated exactly.
| Item Type: | Article |
|---|---|
| Date Type: | Published Online |
| Status: | In Press |
| Schools: | Schools > Physics and Astronomy Schools > Physical, Chemical & Environmental Sciences |
| Additional Information: | RRS policy applied |
| Publisher: | Royal Society of Chemistry |
| ISSN: | 1744-683X |
| Date of First Compliant Deposit: | 29 September 2026 |
| Date of Acceptance: | 7 September 2026 |
| Last Modified: | 29 Sep 2026 09:00 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/189837 |
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