Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Ultra-cold Atoms, Ions and BEC IV (joint session A/Q)

Q 58.2: Talk

Friday, March 15, 2024, 11:15–11:30, HS 1098

Quantum fluctuations in one-dimensional supersolids — •Chris Bühler, Tobias Ilg, and Hans Peter Büchler — Institute for Theoretical Physics III and Center for Integrated Quantum Science and Technology, University of Stuttgart

In one dimension, quantum fluctuations prevent the appearance of long-range order in a supersolid, and only quasi-long-range order can survive. We derive this quantum critical behavior and study its influence on the superfluid response and properties of the solid. The analysis is based on an effective low-energy description accounting for the two coupled Goldstone modes. We find that the quantum phase transition from the superfluid to the supersolid is shifted by quantum fluctuations from the position where the local formation of a solid structure takes place. For current experimental parameters with dipolar atomic gases, this shift is extremely small and cannot be resolved yet, i.e., current observations in experiments are expected to be in agreement with predictions from mean-field theory based on the extended Gross-Pitaevskii formalism.

https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.033092

Keywords: Supersolids; Quantum Fluctuations; Superfluid