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SYAU: Guest Country Symposium Austria: SSelected Highlights of AMOP in Austria"

SYAU 1: Selected highlights of AMOP in Austria

SYAU 1.2: Invited Talk

Wednesday, March 4, 2026, 11:15–11:45, RW 1

Supersolidity: When Superfluid Flow Meets Crystalline Order — •Francesca Ferlaino — Institut für Experimentalphysik, Universität Innsbruck, Austria — IQOQI- Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Innsbruck, Austria

Superfluidity has fascinated physicists for decades, spanning an extraordinary variety of systems - from solids and liquids to dilute gases and even light. At its core, superfluidity arises when many bosonic quantum particles interact collectively. Traditionally, these interactions are short-ranged and isotropic, providing the simplest framework for the emergence of superfluid behavior. But what happens when more complex interactions are allowed to enter the game? What if interactions acquire directionality, extend over longer distances, or compete with one another? Under such conditions, remarkably rich phenomena emerge. Spatially homogeneous systems may spontaneously develop periodic density modulations, raising a cascade of fundamental questions: What does superfluidity mean in the presence of crystalline order? Could a solid, with its crystalline rigidity, exhibit superfluid behavior - or could a superfluid itself acquire crystalline order? These long-standing questions have recently found compelling answers with the experimental discovery of supersolid quantum states - exotic phases of matter that simultaneously display superfluid coherence and crystalline density order. In this colloquium, I will present the experimental realization of supersolidity in magnetic quantum gases, focusing on results obtained in Innsbruck.

Keywords: Quantum Gas; Supersolidity; BEC; Quantum Simulation; Dipolar Ineraction