@article {48675,
	title = {Dynamic heterogeneity in polydisperse systems: a comparative study of the role of local structural order parameter and particle size},
	journal = {Journal of Chemical Physics},
	volume = {159},
	year = {2023},
	month = {JUL},
	pages = {044501},
	type = {Article},
	abstract = {<p>
	In polydisperse systems, describing the structure and any structural order parameter (SOP) is not trivial as it varies with the number of species we use to describe the system, M. Depending on the degree of polydispersity, there is an optimum value of M = M-0 where we show that the mutual information of the system increases. However, surprisingly, the correlation between a recently proposed SOP and the dynamics is highest for M = 1. This effect increases with polydispersity. We find that the SOP at M = 1 is coupled with the particle size, s, and this coupling increases with polydispersity and decreases with an increase in M. Careful analysis shows that at lower polydispersities, the SOP is a good predictor of the dynamics. However, at higher polydispersity, the dynamics is strongly dependent on s. Since the coupling between the SOP and s is higher for M = 1, it appears to be a better predictor of the dynamics. We also study the Vibrality, an order parameter independent of structural information. Compared to SOP, at high polydispersity, we find Vibrality to be a marginally better predictor of the dynamics. However, this high predictive power of Vibrality, which is not there at lower polydispersity, appears to be due to its stronger coupling with s. Therefore, our study suggests that for systems with high polydispersity, the correlation of any order parameter and s will affect the correlation between the order parameter and dynamics and need not project a generic predictive power of the order parameter.</p>
},
	issn = {0021-9606},
	doi = {10.1063/5.0156794},
	author = {Patel, Palak and Sharma, Mohit and Bhattacharyya, Sarika Maitra}
}
@article {49884,
	title = {Dynamic signature of the thermodynamic transition in a novel mean field system},
	journal = {Journal of Chemical Physics},
	volume = {163},
	year = {2025},
	month = {AUG },
	pages = {084510},
	type = {Article},
	abstract = {<p>
	Understanding the connection between thermodynamics and dynamics in glass-forming liquids remains a central challenge in condensed matter physics. In this study, we investigate a novel model system that enables a continuous crossover from a standard three dimensional liquid to a fully connected mean field like system by introducing pseudo neighbors. These pseudo neighbors enhance the effective connectivity of the system without altering its local structure. While their presence slows down the dynamics, they influence thermodynamic properties even more significantly. In particular, the configurational entropy obtained via thermodynamic integration vanishes at a temperature much higher than the temperature where the dynamics begin to slow down, leading to a clear breakdown of the Adam-Gibbs relation. To uncover a possible dynamical signature of this thermodynamic transition, we analyze bond breakage dynamics. Unlike real-real bonds, which decay similarly in both the parent Kob-Andersen model and its mean field variant, real-pseudo bonds exhibit long lived, persistent behavior with strong temperature dependence. These bonds do not fully decay over time, leading to a finite saturation value of the bond breakage correlation function. Remarkably, we show that the number of surviving pseudo bonds can be analytically estimated and correlates directly with the thermodynamic transition temperature T-K. We propose a phenomenological relation between T-K and the number of surviving pseudo-bonds, establishing a novel link between thermodynamic and dynamic observables. Our results suggest that these persistent pseudo bonds serve as a robust dynamical signature of the thermodynamic transition, and the system might have properties analogous to those of randomly bonded ultrastable glasses.</p>
},
	issn = {0021-9606},
	doi = {10.1063/5.0283034},
	author = {Anwar, Ehtesham and Nandi, Ujjwal Kumar and Patel, Palak and Kumawat, Sanket and Maitra Bhattacharyya, Sarika}
}
