BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:Emerging colloidal dynamics away from equilibrium. Chiral active s ystems. DTSTART:20230301T084500 DTEND:20230303T124500 DTSTAMP:20260407T051443Z UID:043415b3ecdbe4cebb88e7e2c09ffd5b5ad74887fffececb2e47ddaf CATEGORIES:Conferences - Seminars DESCRIPTION:You can apply to participate and find all the relevant informa tion (speakers\, abstracts\, program\,...) on the event website: https:// www.cecam.org/workshop-details/1123\n\nDESCRIPTION:\nSoft matter systems i n Nature\, at length-scales spanning the nano- and the microscale\, exhibi t self-assembly far from the thermal equilibrium. Modern self-assembly tec hniques aiming to produce complex structural order or functional diversity often rely on non-equilibrium conditions in the system. Light\, electric\ , or magnetic fields are often used to induce complex out-of-equilibrium o rdering. Such dissipative colloidal materials use energy to generate and m aintain structural complexity. Nontrivial collective dynamics and emerging large-scale structures are often observed in experiments and numerical si mulations [1-24].\nChirality is an intrinsic fundamental property of many natural and artificial systems. Understanding the role of chirality in dyn amics of interacting many-body systems is a major challenge. There has bee n a surge of interest in collective phenomena that arise when chirality co mes into play in both biological [2-4] or artificial [5-9] systems. Micros ystems driven out-of-equilibrium by external torques [10-18] are ideal mod el systems to investigate these phenomena since they avoid the inherent co mplexity of biological active matter [19]. Spinning particles dispersed in a fluid represent a special class of artificial active systems that injec t vorticity at the microscopic level [20-23]. Dense collections of interac ting spinning particles represent a chiral fluid [24]\, which breaks parit y and time-reversal symmetries\, and displays a novel viscosity feature ca lled the odd viscosity [25\, 26]. The odd viscosity has been identified in interacting chiral spinners [24]\, and it led to remarkable effects such as production of flow perpendicular to the pressure [26]\, topological wav es [27]\, or the emergence of edge currents [24]. Magnetic rollers dynamic ally assemble into a vortex under harmonic confinement\, that spontaneousl y selects a sense of rotation and is capable of chirality switching [28\, 29]. Multiple motile vortices unbound from any confinement have been revea led in ensembles of magnetic rollers powered by a uniaxial field [30]. Osc illating chiral flows were generated when a roller liquid was coupled to c ertain obstacles [31]. There has been an increasing effort to investigate collective phenomena in systems with chiral active units [8\, 32-38]. Sync hronized self-assembled magnetic spinners at the liquid interface revealed structural transitions from liquid to nearly crystalline states and demon strated reconfigurability coupled to a self-healing behavior [39]. Activit y-induced synchronization leading to a mutual flocking\, and chiral self-s orting has been observed in modeled ensembles of self-propelled circle swi mmers [40]. Shape anisotropic particles powered by the Quincke phenomenon led to the realization of chiral rollers (similar to circle swimmers) with spontaneously selected handedness of their motion and activity-dependent curvature of trajectories [42]. Multiple unconfined vortices with either p olar or nematic ordering of particles have been revealed [42].\nDeveloping an understanding of complex dynamics in chiral systems driven out-of-equi librium by external fields represents a significant theoretical and comput ational challenge. Some of the features may be understood using phenomenol ogical continuum descriptions [43\,44\,45] Nevertheless\, the microscopic mechanisms leading to the dynamic self-assembly and their relations to the emergent behavior in chiral fluids often remain unclear. Computer simula tions are practically the only method to theoretically investigate such qu estions\; however\, modeling the nonequilibrium self-assembly presents a h uge computational challenge due to the complex many-body interactions and collective dynamics on different time scales. One of the main challenges i s to properly account for the particle-fluid coupling. On a coarse-grained level\, the fluid flow around colloids is modeled by molecular dynamics m ethods like Lattice-Boltzmann [41] and Multi Particle Collision Dynamics [ 46\, 47]. An alternative approach is to describe the colloidal dynamics by molecular dynamics simulations or an amplitude equation (Ginzburg-Landau type equation) coupled to the Navier-Stokes equations describing large-sca le time-averaged hydrodynamic flows induced by the colloids [30\, 48]. LOCATION:BCH 2103 https://plan.epfl.ch/?room==BCH%202103 STATUS:CONFIRMED END:VEVENT END:VCALENDAR