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Hydrodynamic correlation functions of chiral active fluids

https://doi.org/10.1103/PhysRevFluids.7.043301

Banerjee, Debarghya; Souslov, Anton; Vitelli, Vincenzo (April 2022, Physical Review Fluids)

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Active Viscoelasticity of Odd Materials

https://doi.org/10.1103/PhysRevLett.126.138001

Banerjee, Debarghya; Vitelli, Vincenzo; Jülicher, Frank; Surówka, Piotr (March 2021, Physical Review Letters)

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Odd elasticity

https://doi.org/10.1038/s41567-020-0795-y

Scheibner, Colin; Souslov, Anton; Banerjee, Debarghya; Surówka, Piotr; Irvine, William T.; Vitelli, Vincenzo (April 2020, Nature Physics)

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Topological structure and dynamics of three-dimensional active nematics

https://doi.org/10.1126/science.aaz4547

Duclos, Guillaume; Adkins, Raymond; Banerjee, Debarghya; Peterson, Matthew S. E.; Varghese, Minu; Kolvin, Itamar; Baskaran, Arvind; Pelcovits, Robert A.; Powers, Thomas R.; Baskaran, Aparna; et al (March 2020, Science)

Topological structures are effective descriptors of the nonequilibrium dynamics of diverse many-body systems. For example, motile, point-like topological defects capture the salient features of two-dimensional active liquid crystals composed of energy-consuming anisotropic units. We dispersed force-generating microtubule bundles in a passive colloidal liquid crystal to form a three-dimensional active nematic. Light-sheet microscopy revealed the temporal evolution of the millimeter-scale structure of these active nematics with single-bundle resolution. The primary topological excitations are extended, charge-neutral disclination loops that undergo complex dynamics and recombination events. Our work suggests a framework for analyzing the nonequilibrium dynamics of bulk anisotropic systems as diverse as driven complex fluids, active metamaterials, biological tissues, and collections of robots or organisms.
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