@article{ISI:000404227700003,
 abstract = {We describe the basic properties and consequences of introducing active
stresses, with principal direction along the local director, in
cholesteric liquid crystals. The helical ground state is found to be
linearly unstable to extensile stresses, without threshold in the limit
of infinite system size, whereas contractile stresses are
hydrodynamically screened by the cholesteric elasticity to give a finite
threshold. This is confirmed numerically and the non-linear consequences
of instability, in both extensile and contractile cases, are studied. We
also consider the stresses associated to defects in the cholesteric
pitch (lambda lines) and show how the geometry near to the defect
generates threshold-less flows reminiscent of those for defects in
active nematics. At large extensile activity lambda lines are
spontaneously created and can form steady-state patterns sustained by
constant active flows.},
 article-number = {50},
 author = {Whitfield, Carl A. and Adhyapak, Tapan Chandra and Tiribocchi, Adriano
and Alexander, Gareth P. and Marenduzzo, Davide and Ramaswamy, Sriram},
 doi = {10.1140/epje/i2017-11536-2},
 eissn = {1292-895X},
 issn = {1292-8941},
 journal = {EUROPEAN PHYSICAL JOURNAL E},
 month = {APR 24},
 number = {4},
 orcid-numbers = {Whitfield, Carl/0000-0001-5913-735X
Tiribocchi, Adriano/0000-0002-5314-9664
Marenduzzo, Davide/0000-0003-3974-4915},
 researcherid-numbers = {Whitfield, Carl/J-5751-2019
},
 times-cited = {12},
 title = {Hydrodynamic instabilities in active cholesteric liquid crystals},
 unique-id = {ISI:000404227700003},
 volume = {40},
 year = {2017}
}