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SUMMARY:Anisotropic odd viscosity in chiral active fluids - Anton Souslov\
 , University of Bath
DTSTART:20191015T120000Z
DTEND:20191015T130000Z
UID:TALK130867@talks.cam.ac.uk
CONTACT:Etienne Fodor
DESCRIPTION:Chiral active fluids are materials composed of self-spinning r
 otors that continuously inject energy and angular momentum at the microsca
 le. Out-of-equilibrium fluids with active-rotor constituents have been exp
 erimentally realised using nanoscale biomolecular motors\, microscale acti
 ve colloids\, or macroscale driven chiral grains. I will discuss how chira
 l active fluids break both parity and time-reversal symmetries in their st
 eady states\, giving rise to dissipationless linear-response coefficients 
 in the viscosity tensor\, collectively called odd (equivalently\, Hall) vi
 scosity. I will then discuss how spatially anisotropic viscous coefficient
 s and stresses can be designed by applying a time-modulated drive. If the 
 drive induces a rotation whose rate is slowed down when the constituents p
 oint along specific directions\, anisotropic structures and mechanical res
 ponses arise at long timescales. Classical fluids with internal torques ca
 n display additional components of the odd viscosity neglected in previous
  studies of quantum Hall fluids that assumed angular momentum conservation
 . These anisotropic and angular momentum-violating odd-viscosity coefficie
 nts can change even the bulk flow of an incompressible fluid by acting as 
 a source of vorticity. In addition\, shear distortions in the shape of an 
 inclusion result in torques.\n\n1. A. Souslov\, A. Gromov\, V. Vitelli. An
 isotropic odd viscosity via time-modulated drive. arXiv:1909.08505 (2019)\
 n\n2. D. Banerjee\, A. Souslov\, A. G. Abanov\, V. Vitelli. Odd viscosity 
 in chiral active fluids. Nat. Commun. 8\, 1573 (2017)
LOCATION:MR11\, CMS
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