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Jawaharlal Nehru Centre for Advanced Scientific Research - An Autonomous Institution
Jawaharlal Nehru Centre for Advanced Scientific Research - An Autonomous Institution

Theoretical Sciences Unit Seminar - 26 September 2022

Theoretical Sciences Unit Seminar

Date: 26th September 2022 (Monday)

Time: 11:00 AM (Tea/Coffee: 10:45 AM)

Venue: Kanada Auditorium, JNCASR

Title: Identifying Structural Signature of Dynamical Heterogeneity via the Local Softness Parameter

Speaker: Dr. Sarika Maitra Bhattacharyya

Affiliation: Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune

Abstract:

The origin of dynamic heterogeneity (DH) in supercooled liquids is a topic of intense research [1-3]. It is often suggested that, similar to crystals, structural defects in supercooled liquids contribute to DH. However, identifying these structural defects is a nontrivial challenge [4].

We utilize the softness of a mean field caging potential, developed in our previous work [5,6], as an order parameter to capture structural heterogeneity. Our findings indicate that the lifetime of this softness parameter aligns with the lifetime of the cage [7]. Moreover, we predict that the local softness and local dynamics exhibit a causal relationship, where decreasing temperature enhances the correlation between structure and dynamics.

This study reveals that lower temperatures lead to an increase in structural heterogeneity. As the structure becomes a more effective predictor of dynamics, the degree of DH consequently increases.

References:

  • [1] A. Widmer-Cooper, H. Perry, P. Harowell, and D. Reichman, Nat. Phys. 4, 711 (2016).
  • [2] S. S. Schoenholz, E. D. Cubuk, and D. Sussman et al., Nat. Phys. 12, 469 (2016); F. P. Landes, G. Biroli, O. Dauchot, A. J. Liu, and D. R. Reichman, Phys. Rev. E 101, 010602 (2020).
  • [3] G. Kapteijns et al., J. Chem. Phys. 155, 074502 (2021).
  • [4] D. Wei et al., J. Chem. Phys. 150, 114502 (2019).
  • [5] M. K. Nandi, A. Banerjee, C. Dasgupta and S. M. Bhattacharyya, Phys. Rev. Lett., 119, 265502 (2017).
  • [6] M. K. Nandi and S. M. Bhattacharyya, Phys. Rev. Lett. 126, 208001 (2021).
  • [7] M. Sharma, M. K. Nandi, S. M. Bhattacharyya, Phys. Rev. E 105, 044604 (2022).

All are cordially invited.

Event Date :
Place of the event :
JNCASR
Organised by :
Theoretical Sciences Unit
Other Venue :
Sponsored Event :
High tea time :
Organising Team :
Prof. Srikanth Sastry