Recent Research highlights


  • The principles governing the formation of surface alloys were studied and understood. It was clarified that, in general, a criterion akin to the Hume-Rothery rule that applies in three dimensional alloys, will not apply for two-dimensional alloys on a substrate. Several candidate systems of surface alloys of bulk-immiscible components were identified. One of these, iron-gold on a ruthenium substrate, was synthesized by experimental collaborators. It was shown that the driving force for alloying in this system was, surprisingly, not stress relief but magnetism.

  • A new approach to controlling the morphology of metal clusters on oxide substrates, viz., by doping the substrate, was suggested. This has possible applications in nanocatalysis.

  • It was shown that the effective coordination number may serve as a simple indicator for adsorption energies and dissociation barriers, by looking at the binding and dissociation of nitrogen monoxide on rhodium substrates

  • Developed and studied computationally a model for gelation without the intervention of phase separation, and explained compressed exponential relaxation in this model.

  • Analyzed length scales associated with growing relaxation times in model glass formers, revealing surprises and disparities with theoretical expectations

  • Developed a model for aggregating proteins.

  • Analyzed the protein glass transition in terms of changes in the properties of hydration water showed that the jamming density of frictionless spheres was not unique but dependent on the equilibrium properties of fluid configurations that are subjected to jamming

  • Established the presence of a liquid-liquid critical point in supercooled silicon using computer simulations of a model of silicon.

  • An exact and mean-field theory based derivation of Ginzburg-Landau theory of ferroelectric

  • Electronic structure and deformation mechanisms in grapheme associated with topological defects, doping and edges.

  • Model for buckling transition in graphene.

  • Determination of the structural origin of oxygen storage capacity of transition metal doped ceria

  • Show that the unconventional charge-density wave in dichalcogenides can be understood as an instability of a strongly correlated excitonic liquid

  • Found strong evidence for a quantum critical point within the superconducting dome in the phase diagram of the two-dimensional Hubbard model relevant for the cuprate superconductors.

  • Developed a new spreading impedance approach for modeling organic semiconductor devices.

  • Applied to organic position sensing devices and organic bulk heterojunction based solar cells.

  • Developed a Kinetic Monte Carlo technique for modeling average current and its fluctuations in a disordered organic bulk heterojuction matrix.

  • Developed a theory for understanding the weak ferro-magnetism  and canting of the anti-ferromagnetic backbone in orthoferrites  such as YFe_{1-x}Cr_xO_3.

  • Classification of deterministic and stochastic regimes of asexual evolution on uncorrelated fitness landscapes.

  • Demonstration of nonzero current in periodically forced systems with no net bias.

  • Identification of novel probability distribution functions for statistics of correlated random variables.

  • Development of analytical techniques for handling nonlinear equations governing the evolution of sexual populations. 

  • Application of Finite-size Scaling theory in kinetics of phase separation.

  • Universality in finite-size effects in domain coarseing problems with conserved order parameter.

  • Hydrodynamic effects in fluid phase separation.

  • Kinetics of droplet growth in metastable region of the coexistence curve.

  • Curvature dependence of interfacial tension and related universality in critical behavior

  • Thermodynamic integration method to calculate contact angle in wetting phenomena.

  • Critical singularities in transport properties and related finite-size effects.

  • Effect of disorder in nonequilibrium evolution governed by the complex GinzburgLandau equation.

  • Understanding of defect-defect interaction in the complex Ginzburg-Landau equation.

 


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