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SYAD: Symposium SAMOP Dissertation Prize 2026

SYAD 1: SAMOP Dissertation Prize Symposium

SYAD 1.3: Hauptvortrag

Montag, 2. März 2026, 15:30–16:00, RW 1

Pattern Formation and Supersolid-like Sound Modes in a Driven Superfluid — •Nikolas Liebster — Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany

Driven systems are of fundamental scientific interest, as they can exhibit properties distinct from the same system at equilibrium. Although driving generically introduces heating and therefore disorder, certain classes of driven systems can instead support long-lived states with emergent material properties. In this talk, we discuss the emergence of self-stabilized square lattice patterns in a superfluid with periodically modulated interactions. We then show that these patterned states share key physical properties to a seemingly different equilibrium system, namely supersolids. To demonstrate this correspondence, we probe the excitation spectrum of such a patterned state, identifying two distinct sound modes associated with spontaneously broken U(1) and translational symmetries. A third sound mode, the transverse lattice mode, is found to be diffusive. We apply a hydrodynamic theory of superfluid smectics, enabling the extraction of the lattice compressibility as well as the superfluid fraction. These results demonstrate how the conceptual framework of supersolidity can be used to characterize dynamic and far-from-equilibrium states.

Keywords: Supersolidity; Pattern Formation; Driven Systems; Superfluids