Author(s): Stefano Scopa, Philip Zechmann, Michael Knap, Jacopo De Nardis, and Alvise Bastianello Objects subjected to a constant force generally increase their velocity over time. This expectation fails whenever their energy is a smooth and periodic function of momentum, resulting in periodic Bloch oscillations instead. Periodic dispersions, typical of lattice systems, can also emerge in contin… [Phys. Rev. Lett. 137, 113404] Published Fri Sep 11, 2026