Publications in Peer Reviewed Journals

1) Theory and simulation for equilibrium glassy dynamics in cellular Potts model of confluent biological tissue, Souvik Sadhukhan and Saroj Kumar Nandi,  Phys. Rev. E, 2021.

|| Key finding: Characterized glass-like dynamics in a confluent cell monolayer using the cellular Potts model and extended the random first-order transition theory of equilibrium glass for biological systems for the first time. There are two distinct relaxation regimes: sub-Arrhenius and super-Arrhenius. ||

2) On the origin of universal cell shape variability in confluent epithelial monolayers, Souvik Sadhukhan and Saroj Kumar Nandi,  eLife, 2022.

|| Key finding: Developed a compact mathematical form of the cell shape (aspect ratio) distribution and connected it with simulation data of the cellular Potts model and Vertex model of confluent tissues.  ||

3) A shape-driven reentrant jamming transition in confluent monolayers of synthetic cell-mimics, Pragya Arora, Souvik Sadhukhan, Saroj Kumar Nandi, Dapeng Bi, A. K. Sood, Rajesh Ganapathy,  Nature Communications, 2024 (Featured as an Editor's Highlight in Applied Physics and Mathematics).

|| Key finding: Designed a monolayer of synthetic cell mimics and found that fast cells show suppressed shape variability due to a transient confinement effect of these cells by their slower neighbors. ||

4) Motility driven glassy dynamics in confluent epithelial monolayers, Souvik Sadhukhan*, Manoj Kumar Nandi, Satyam Pandey, Matteo Paoluzzi, Chandan Dasgupta, Nir S. Gov and  Saroj Kumar Nandi,  Soft Matter, 2024.

|| Key finding:  Showed the bare rotational diffusion constant (Dr) gets modified due to confluency using the Vertex model and extended the random first-order transition theory of glass for an active confluent cell layer, accounting the effcet of effective rotational diffusion constant. ||

5) A perspective on active glassy dynamics in biological systems, Souvik Sadhukhan, Subhodeep Dey, Smarajit Karmakar and  Saroj Kumar Nandi,  Eur. Phys. J. Spec. Top., 2024.

|| Key finding:  Pointed out the key developments of the active biological systems in the last few decades: theories and experiments. ||

6) The structure-dynamics feedback mechanism governs the glassy dynamics in epithelial monolayers, Satyam Pandey, Soumitra Kolya, Padmashree Devendran, Souvik Sadhukhan,  Tamal Das, and  Saroj Kumar Nandi,  Soft Matter, 2024.

|| Key finding:  Showed that statics (structure) and dynamics in a confluent cell monolayer are related to each other, which is well suited for the Mode-Coupling theory (MCT). MCT performs well in the sub-Arrhenius regime, and RFOT works better in the super-Arrhenius regime.||

7) Growing length and time scales in activity-mediated glassy dynamics in confluent cell monolayers, Souvik Sadhukhan*, Chandan Dasgupta and Saroj Kumar Nandi,  Phys. Rev. E, 2025.

|| Key finding:  Showed that the structure-dynamics feedback mechanism still holds for active confluent systems using the Vertex model and computed the dynamic length scale using finite-size scaling first for such systems. The growing dynamic length scale has a power-law dependence on the relaxation time. ||

8) Fluctuation-dominated phase ordering in the one-dimensional truncated inverse-distance square Ising model, Souvik Sadhukhan*, Mustansir Barma and Saroj Kumar Nandi,  Phys. Rev. E, 2025.

|| Key finding:  Performed Monte-Carlo simulations on the Truncated Inverse Distance Square Ising model (TIDSI) and observed fluctuation-dominated phase ordering (FDPO), where macroscopic fluctuations coexist with long-range order. Simulation results of cusped-like singularity in spatial correlation, limiting distribution of the largest cluster, mean cluster size etc. macthes with the analytical forms reported earlier. Cusp exponent of the aging auto-correlation function is related with the cusp exponent of the spatial auto-correlation function.||