Debankur Das
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View article: Activated solids: Spontaneous deformations, non-affine fluctuations, softening, and failure
Activated solids: Spontaneous deformations, non-affine fluctuations, softening, and failure Open
We investigate spontaneous deformations in activated solids by analyzing crystal deformations through non-affine fluctuations. A scaling law for non-affinity is derived, showing it scales quadratically with activity and inversely with dens…
View article: Universal stress correlations in crystalline and amorphous packings
Universal stress correlations in crystalline and amorphous packings Open
We present a universal characterization of stress correlations in athermal systems, across crystalline to amorphous packings. Via numerical analysis of static configurations of particles interacting through harmonic as well as Lennard-Jone…
View article: Friction of a driven chain: role of momentum conservation, Goldstone and radiation modes
Friction of a driven chain: role of momentum conservation, Goldstone and radiation modes Open
We analytically study friction and dissipation of a driven bead in a 1D harmonic chain, and analyze the role of internal damping mechanism as well as chain length. Specifically, we investigate Dissipative Particle Dynamics and Langevin Dyn…
View article: Friction of a driven chain: Role of momentum conservation, Goldstone and radiation modes
Friction of a driven chain: Role of momentum conservation, Goldstone and radiation modes Open
We analytically study friction and dissipation of a driven bead in a 1D harmonic chain, and analyze the role of internal damping mechanism as well as chain length. Specifically, we investigate Dissipative Particle Dynamics and Langevin Dyn…
View article: Memory-induced Magnus effect
Memory-induced Magnus effect Open
Spinning objects moving through air or a liquid experience a lift force—a phenomenon known as the Magnus effect. This effect is commonly exploited in ball sports but also is of considerable importance for applications in the aviation indus…
View article: Memory induced Magnus effect
Memory induced Magnus effect Open
Spinning objects which move through air or liquids experience a Magnus force. This effect is commonly exploited in ball sports but also of considerable importance for applications and fundamental science. Opposed to large objects where Mag…
View article: Emergent power-law interactions in disordered crystals
Emergent power-law interactions in disordered crystals Open
We derive exact results for the fluctuations in energy produced by microscopic disorder in near-crystalline athermal systems. Our formalism captures the heterogeneity in the elastic energy of polydispersed soft disks in energy-minimized co…
View article: Displacement correlations in disordered athermal networks
Displacement correlations in disordered athermal networks Open
We derive exact results for correlations in the displacement fields $\{ δ\vec{r} \} \equiv \{ δr_{μ= x,y} \}$ in near-crystalline athermal systems in two dimensions. We analyze the displacement correlations produced by different types of m…
View article: Disorder perturbation expansion for athermal crystals
Disorder perturbation expansion for athermal crystals Open
We introduce a perturbation expansion for athermal systems that allows an exact determination of displacement fields away from the crystalline state as a response to disorder. We show that the displacement fields in energy-minimized config…
View article: Long-range correlations in pinned athermal networks
Long-range correlations in pinned athermal networks Open
We derive exact results for displacement fields that develop as a response to external pinning forces in two-dimensional athermal networks. For a triangular lattice arrangement of particles interacting through soft potentials, we develop a…
View article: Long-range correlations in actively pinned athermal networks
Long-range correlations in actively pinned athermal networks Open
We derive analytic results for displacement fields that develop as a response to external forces on athermal networks in two dimensions. For a triangular lattice arrangement of particles interacting through soft potentials, we develop a Gr…
View article: Wrinkles, folds, and ripplocations: Unusual deformation structures of confined elastic sheets at nonzero temperatures
Wrinkles, folds, and ripplocations: Unusual deformation structures of confined elastic sheets at nonzero temperatures Open
We study the deformation of a fluctuating crystalline sheet confined between two flat rigid walls as a simple model for layered solids where bonds among atoms within the same layer are much stronger than those between layers. When subjecte…
View article: Pleating and irreversible deformation of a flat, stretched, sheet at non-zero temperatures
Pleating and irreversible deformation of a flat, stretched, sheet at non-zero temperatures Open
We study the emergence of pleats in a stretched two-dimensional sheet composed of connected vertices arranged as a regular triangular lattice. We consider only flat-foldable pleats i.e. those with all displacements restricted to the two-di…