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- Nirmalendu Ganai, Surajit Sengupta, G. I. Menon
- Nucleic acids research
- 2014

Chromosomes within eukaryotic cell nuclei at interphase are not positioned at random, since gene-rich chromosomes are predominantly found towards the interior of the cell nucleus across a number of cell types. The physical mechanisms that could drive and maintain the spatial segregation of chromosomes based on gene density are unknown. Here, we identify a… (More)

Elastic moduli and dislocation core energy of the triangular solid of hard disks of diameter σ are obtained in the limit of vanishing dislocationantidislocation pair density, from Monte Carlo simulations which incorporates a constraint, namely that all moves altering the local connectivity away from that of the ideal triangular lattice are rejected. In this… (More)

- D. Wilms, Peter Virnau, Surajit Sengupta, Kurt Binder
- Physical review. E, Statistical, nonlinear, and…
- 2012

Langevin dynamics simulations are used to study the effect of shear on a two-dimensional colloidal crystal (with implicit solvent) confined by structured parallel walls. When walls are sheared very slowly, only two or three crystalline layers next to the walls move along with them, while the inner layers of the crystal are only slightly tilted. At higher… (More)

- Krista Zahn, Anja Wille, Georg Maret, Surajit Sengupta, P. Nielaba
- Physical review letters
- 2003

Elastic constants of two-dimensional (2D) colloidal crystals are determined by measuring strain fluctuations induced by Brownian motion of particles. Paramagnetic colloids confined to an air-water interface of a pendant drop are crystallized under the action of a magnetic field, which is applied perpendicular to the 2D layer. Using video microscopy and… (More)

- Jeetu S Babu, Chandana Mondal, Surajit Sengupta, S. N. Karmakar
- Soft matter
- 2016

The conditions which determine whether a material behaves in a brittle or ductile fashion on mechanical loading are still elusive and comprise a topic of active research among materials physicists and engineers. In this study, we present the results of in silico mechanical deformation experiments from two very different model solids in two and three… (More)

- Sumanta Mukherjee, Arnab Saha, Pralay K Santra, Surajit Sengupta, Debjit Das Sarma
- The journal of physical chemistry. B
- 2014

We study the phenomenon of evaporation-driven self-assembly of a colloid suspension of silica microspheres in the interior region and away from the rim of the droplet on a glass plate. In view of the importance of achieving a large-area, monolayer assembly, we first realize a suitable choice of experimental conditions, minimizing the influence of many other… (More)

- Saswati Ganguly, Surajit Sengupta, Peter Sollich, Madan Rao
- Physical review. E, Statistical, nonlinear, and…
- 2013

A systematic coarse graining of microscopic atomic displacements generates a local elastic deformation tensor D as well as a positive definite scalar χ measuring nonaffinity, i.e., the extent to which the displacements are not representable as affine deformations of a reference crystal. We perform an exact calculation of the statistics of χ and D and their… (More)

- W. Strepp, Surajit Sengupta, P. Nielaba
- Physical review. E, Statistical, nonlinear, and…
- 2001

The nature of freezing and melting transitions for a system of hard disks in a spatially periodic external potential is studied using extensive Monte Carlo simulations. Detailed finite size scaling analysis of various thermodynamic quantities like the order parameter, its cumulants, etc., are used to map the phase diagram of the system for various values of… (More)

- Annarita Ricci, P. Nielaba, Surajit Sengupta, Kurt Binder
- Physical review. E, Statistical, nonlinear, and…
- 2006

We investigate the nature of the ordered phase for a model of colloidal particles confined within a quasi-one-dimensional (Q1D) strip between two parallel boundaries, or walls, separated a distance D in two dimensions (2D). Using Monte Carlo simulations we find that at densities typical of the bulk 2D triangular solid the order in the D1D strip is… (More)

- Chandana Mondal, Surajit Sengupta
- Physical review. E, Statistical, nonlinear, and…
- 2012

We report computer simulation studies of the kinetics of ordering of a two-dimensional system of particles on a template with a one-dimensional periodic pattern. In equilibrium, one obtains a reentrant liquid-solid-liquid phase transition as the strength of the substrate potential is varied. We show that domains of crystalline order grow as ~t(1/z), with… (More)