409 citations · 2.2k across the 36 of their papers we have counts for
16 papers · 1 filter
Nonequilibrium noise emerging from broken detailed balance in active gels
Ashot Matevosyan, Frank Jülicher, Ricard Alert
In thermodynamic equilibrium, the fluctuation-dissipation theorem links thermal fluctuations and dissipation. Biological systems, however, are driven out of equilibrium by internal…
Lattice-dependent orientational order in active crystals
Till Welker, Ricard Alert
Via mechanisms not accessible at equilibrium, self-propelled particles can form phases with positional order, such as crystals, and with orientational order, such as polar flocks.…
Discontinuous transition to active nematic turbulence
Malcolm Hillebrand, Ricard Alert
Active fluids exhibit chaotic flows at low Reynolds number known as active turbulence. Whereas the statistical properties of the chaotic flows are increasingly well understood, the…
Active screws: Emergent active chiral nematics of spinning self-propelled rods
Debarghya Banerjee, Lauritz Hahn, Ricard Alert
Several types of active agents self-propel by spinning around their propulsion axis, thus behaving as active screws. Examples include cytoskeletal filaments in gliding assays, magn…
Buckling by disordered growth
Rahul G. Ramachandran, Ricard Alert, Pierre A. Haas
Buckling instabilities driven by tissue growth underpin key developmental events such as the folding of the brain. Tissue growth is disordered due to cell-to-cell variability, but…
Dynamical arrest in active nematic turbulence
Ido Lavi, Ricard Alert, Jean-François Joanny +1
Active fluids display spontaneous turbulent-like flows known as active turbulence. Recent work revealed that these flows have universal features, independent of the material proper…
Nonlinear spontaneous flow instability in active nematics
Ido Lavi, Ricard Alert, Jean-François Joanny +1
Active nematics exhibit spontaneous flows through a well-known linear instability of the uniformly-aligned quiescent state. Here we show that even a linearly stable uniform state c…
Flocking by Turning Away
Suchismita Das, Matteo Ciarchi, Ziqi Zhou +3
Flocking, as paradigmatically exemplified by birds, is the coherent collective motion of active agents. As originally conceived, flocking emerges through alignment interactions bet…
Local polar order controls mechanical stress and triggers layer formation in developing Myxococcus xanthus colonies
Endao Han, Chenyi Fei, Ricard Alert +4
Colonies of the social bacterium Myxococcus xanthus go through a morphological transition from a thin colony of cells to three-dimensional droplet-like fruiting bodies as a strateg…
Fingering Instability of Active Nematic Droplets
Ricard Alert
From the mitotic spindle up to tissues and biofilms, many biological systems behave as active droplets, which often break symmetry and change shape spontaneously. Here, I show that…
Active Turbulence
Ricard Alert, Jaume Casademunt, Jean-François Joanny
Active fluids exhibit spontaneous flows with complex spatiotemporal structure, which have been observed in bacterial suspensions, sperm cells, cytoskeletal suspensions, self-propel…
Scaling regimes of active turbulence with external dissipation
Berta Martínez-Prat, Ricard Alert, Fanlong Meng +5
Active fluids exhibit complex turbulent-like flows at low Reynolds number. Recent work predicted that 2d active nematic turbulence follows universal scaling laws. However, experime…
Active phase separation by turning toward regions of higher density
Jie Zhang, Ricard Alert, Jing Yan +2
Studies of active matter, from molecular assemblies to animal groups, have revealed two broad classes of behavior: a tendency to align yields orientational order and collective mot…
Universal scaling of active nematic turbulence
Ricard Alert, Jean-François Joanny, Jaume Casademunt
A landmark of turbulence is the emergence of universal scaling laws, such as Kolmogorov's scaling of the kinetic energy spectrum of inertial turbulence with the…
Formation of metastable phases by spinodal decomposition
Ricard Alert, Pietro Tierno, Jaume Casademunt
Metastable phases may be spontaneously formed from other metastable phases through nucleation. Here we demonstrate the spontaneous formation of a metastable phase from an unstable…
Landscape-Inversion Phase Transition in Dipolar Colloids: Tuning the Structure and Dynamics of 2D Crystals
Ricard Alert, Jaume Casademunt, Pietro Tierno
We study the 2D crystalline phases of paramagnetic colloidal particles with dipolar interactions and constrained on a periodic substrate. Combining theory, simulation, and experime…