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Chiral active fluids

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  • UserDr Anton Souslov, Department of Physics, University of Bath
  • ClockTuesday 07 May 2019, 14:00-15:00
  • HouseMech Eng - G34.

If you have a question about this talk, please contact Dr Dwaipayan Chakrabarti.

I2S Seminar hosted by Dr Dwaipayan Chakrabarti

Active liquids are composed of self-driven particles, on scales ranging from biomolecular to colloidal and macroscopic. These particles consume energy in order to move themselves, which in turn endows the liquid with a unique set of mechanical characteristics. I will present two designs for materials exhibiting so-called topological states: one using microfluidic confinement of an active colloidal liquid and another using a bulk fluid without periodic order. In a periodic channel geometry, confinement controls the structure of topological density waves in the fluid. Without periodic order, topological edge states can arise in a fluid that has an acoustic gap at low frequency, for example due to rotation. Fluids that are both chiral and active are characterised by an anomalous response coefficient called odd (or Hall) viscosity. I will explore how the number and spatial profile of topological edge states depends on this response. As the sign of odd viscosity changes, a topological phase transition occurs without closing the bulk band gap.

This talk is part of the School of Chemistry Seminars series.

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