@article{WOS:000558567200004,
 abstract = {We present a large-scale numerical study, supplemented by experimental
observations, on a quasi-two-dimensional active system of polar rods and
spherical beads confined between two horizontal plates and energised by
vertical vibration. For a low rod concentration phi(r), our observations
are consistent with a direct phase transition, as bead concentration
phi(b)is increased, from the isotropic phase to a homogeneous flock. For
phi(r)above a threshold value, an ordered band dense in both rods and
beads occurs between the disordered phase and the homogeneous flock, in
both experiments and simulations. Within the size ranges accessible, we
observe only a single band, whose width increases with phi(r). Deep in
the ordered state, we observe broken-symmetry ``sound″ modes and
giant number fluctuations. The direction-dependent sound speeds and the
scaling of fluctuations are consistent with the predictions of field
theories of flocking; sound damping rates show departures from such
theories, but the range of wavenumbers explored is modest. At very high
densities, we see phase separation into rod-rich and bead-rich regions,
both of which move coherently.},
 author = {Soni, Harsh and Kumar, Nitin and Nambisan, Jyothishraj and Gupta, Rahul
Kumar and Sood, A. K. and Ramaswamy, Sriram},
 doi = {10.1039/c9sm02552a},
 eissn = {1744-6848},
 issn = {1744-683X},
 journal = {SOFT MATTER},
 month = {AUG 21},
 number = {31},
 orcid-numbers = {Kumar, Nitin/0000-0003-2697-4842
Nambisan, Jyothishraj/0000-0001-9808-959X
Ramaswamy, Sriram/0000-0001-7726-8556},
 pages = {7210-7221},
 researcherid-numbers = {Kumar, Nitin/AAS-3576-2020
},
 title = {Phases and excitations of active rod-bead mixtures: simulations and
experiments},
 unique-id = {WOS:000558567200004},
 volume = {16},
 year = {2020}
}