Three-dimensional spontaneous flow transition in a homeotropic active nematic

Pratley, Vincenzo J. (avtor), Caf, Enej (avtor), Ravnik, Miha (avtor), Alexander, Gareth P. (avtor)

Active nematics are driven, non-equilibrium systems relevant to biological processes including tissue mechanics and morphogenesis, and to active metamaterials in general. We study the three-dimensional spontaneous flow transition of an active nematic in an infinite slab geometry using a combination of numerics and analytics. We show that it is determined by the interplay of two eigenmodes – called S- and D-mode – that are unstable at the same activity threshold and spontaneously breaks both rotational symmetry and chiral symmetry. The onset of the unstable modes is described by a non-Hermitian integro-differential operator, which we determine their exponential growth rates from using perturbation theory. The S-mode is the fastest growing. After it reaches a finite amplitude, the growth of the D-mode is anisotropic, being promoted perpendicular to the S-mode and suppressed parallel to it, forming a steady state with a full three-dimensional director field and a well-defined chirality. Lastly, we derive a model of the leading-order time evolution of the system close to the activity threshold.

• Jezik: Angleški jezik
• Ključne besede: nematic fluids, active nematics
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Različica publikacije: Objavljena publikacija
• Datum objave: 13.04.2024
• Leto izida: 2024
• Št. strani: 13 str.
• Številčenje: Vol. 7, art. no. ǂ127
• PID: 20.500.12556/RUL-156067
• UDK: 532.5
• ISSN pri članku: 2399-3650
• DOI: 10.1038/s42005-024-01611-y
• COBISS.SI-ID: 194618883
• Datum objave v RUL: 07.05.2024

Gradivo je del revije

• Naslov: Communications physics
• Skrajšan naslov: Commun. phys.
• Založnik: Springer Nature
• ISSN: 2399-3650
• COBISS.SI-ID: 2048602387

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: nematske tekočine, aktivni nematiki