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SYPD: PhD Symposium – Many-body Physics in Ultracold Quantum Systems

SYPD 1: Many-body Physics in Ultracold Quantum Systems

SYPD 1.2: Hauptvortrag

Donnerstag, 9. März 2023, 15:00–15:30, E415

Many-body physics in dipolar quantum gases — •Francesca Ferlaino — Institute for Experimental Physics, University of Innsbruck, Austria — Institute for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Sciences, Innsbruck, Austria

Brought to quantum degeneracy, ultracold gases enable the study of many-body quantum phenomena, in which the interaction between atoms can be so carefully mastered as to determine the very state of matter. Typically, this interaction has a short-range and isotropic nature, the latter meaning that the atoms globally attract or repel each other. However, there is another possibility that naturally emerges for some specific atomic species, such as erbium and dysprosium, featuring an extraordinarily large magnetic dipole moment. Magnetic properties give rise to dipolar many-body interactions, qualitatively very different from others in that they are long-range and anisotropic, thus adding connectivity and directionality at the quantum level.

In the present talk, we will retrace the fundamental steps in the study of dipolar gases, with emphasis on the Innsbruck results, from their creation to the new phenomena unveiled such as the emergence of rotonic excitations, so named by Landau, to the observation of a new and paradoxical state of matter with multiple spontaneous symmetry breaking, known as supersolid.