Supersolidity in dipolar Bose-Einstein condensates | Tim Langen

▶ Title: Supersolidity in dipolar Bose-Einstein condensates
▶ Abstract:
I will discuss a series of experimental and theoretical studies of supersolidity using dipolar Bose-Einstein condensates. In the first part of the talk, I will focus on quantum gases of magnetic dysprosium atoms. I will present observations of droplet supersolids in cigar-shaped geometries, the characterization of fluctuations and elementary excitations across the BEC-to-supersolid phase transition, as well as extensive theoretical studies of the respective excitation spectra. Notably, the latter include characteristic Goldstone and Higgs modes, which proof the superfluid nature of the supersolid states in the experiments. Moreover, in oblate geometries we experimentally study angular and radial roton modes and their role in the crystallization of the system. In particular, we theoretically identify regimes where spontaneous rotational symmetry breaking leads to the emergence of a 2D droplet supersolid. We further predict the existence of a large variety of novel phases that go beyond the paradigm of droplet supersolidity, and which have strong connections to the field of pattern formation. These phases include honeycomb and labyrinthine states, as well as a pumpkin phase. In the second part of the talk, I will discuss how such exotic supersolid states could be explored further in future experiments with Bose-Einstein condensates of strongly dipolar molecules.
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The Munich Conference on Quantum Science and Technology 2022 brings together the Munich quantum community with international invited guests in academia and industry for three days of talks and poster sessions. Join hundreds of guests from around the world in the beautiful Bavarian Alps from July 4-6, 2022 to exchange ideas, learn about innovative research, and discuss the latest advancements in all fields of quantum science and technology.
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