| Description: | [DPS Seminar] Suman Dutta (S. N. Bose National Centre for Basic Sciences) -- Microscopic Insights into Dynamical Heterogeneity in a Driven Colloid |
| Date: | Wednesday, Dec 06, 2017 |
| Time: | 2 p.m. - 3:30 p.m. |
| Venue: | 113, DPS Meeting Room, RC |
| Details: | The connection between dynamic heterogeneity and the structure formation in nonequilibrium systems is a topic of profound interest in recent times yet an open question. We address this issue, in a model system of constantly driven oppositely charged binary colloidal suspension using Brownian Dynamics simulations. We show that the system undergoes a cross-over from an initial fastrelaxing homogeneous state to a lane state via an intermediate heterogeneous state with anomalous dynamical responses, like the exponential tail in probability distributions of particle displacements and a stretched exponential structural relaxation. We show that the anomaly is due to heterogeneity in diffusion. This manifests in heterogeneous structures that has a spectrum of timescales of relaxation. We also show that the onset of this heterogeneity appears as soon as the field is switched on and persists till in the steady states. However, this is absent once the field is turned off while the lane state reverts back to equilibrium under thermal fluctuations. The framework could be adopted in exploring heterogeneous transport processes in similar systems with structural heterogeneity. |
| Calendar: | Seminar Calendar (entered by anandamohan) |