Federico Ghimenti

All Publications

• Odd Dynamics of Passive Objects in a Chiral Active Bath. Physical review letters Hargus, C., Ghimenti, F., Tailleur, J., van Wijland, F. 2025; 135 (16): 167102

  Abstract

  When submerged in a chiral active bath, a passive object becomes a spinning ratchet imbued with odd transport properties. We present the most general Langevin dynamics for a rigid body in a chiral active bath, in the adiabatic limit of large object mass. For rotationally symmetric objects, odd diffusion and odd mobility are connected by an Einstein relation, that we show numerically to break down outside the adiabatic limit. As the object symmetry decreases, its dynamics becomes increasingly irreversible: A massive disk exhibits an effective equilibrium dynamics, while a rod admits distinct translational and rotational temperatures, and a wedge is fully irreversible. Conversely, this departure from equilibrium can be read in universal far-field currents and density modulations of the bath, which we measure numerically and derive analytically.

  View details for DOI 10.1103/pdpf-sd9q

  View details for PubMedID 41172173

• Irreversible swap algorithms for soft sphere glasses. Physical review. E Nishikawa, Y., Ghimenti, F., Berthier, L., van Wijland, F. 2025; 111 (4-2): 045416

  Abstract

  We extend to soft repulsive interaction potentials a recently proposed irreversible swap algorithm originally designed for polydisperse hard spheres. The original algorithm performs rejection-free, irreversible, collective swap moves. We show that event-driven cluster updates of particle diameters can also be performed in continuous potentials by introducing a factorized Metropolis probability. However, the Metropolis factorization needed to deal with continuous potentials decreases the efficiency of the algorithm and mitigates the benefits of breaking detailed balance. This leads us to propose another irreversible swap algorithm using the standard Metropolis probability that accelerates the relaxation of soft sphere glasses at low temperatures compared to the original swap algorithm. We apply these efficient swap algorithms to produce very stable inherent structures with vibrational density of states lacking the quasilocalized excitations observed in conventional glasses.

  View details for DOI 10.1103/PhysRevE.111.045416

  View details for PubMedID 40410981