Mainz 2026 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster – Ultra-cold atoms, ions and BEC (joint session A/Q)

Q 64.26: Poster

Thursday, March 5, 2026, 17:00–19:00, Philo 1. OG

Morphological false vacuum decay in dipolar supersolids — •Wyatt Kirkby^1,2, Thomas Gasenzer², and Lauriane Chomaz¹ — ¹Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany — ²Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany

We theoretically study false vacuum decay between two morphologically distinct phases of a two-dimensional atomic dipolar supersolid via bubble nucleation, within an extended Gross-Pitaevskii framework including quantum fluctuations. We model the decay rate by deriving an effective action and instanton bounce solution describing the transition between honeycomb and stripe supersolid orders. Numerical simuations of stochastic decay events are then compared against this field-theoretic approach. We also compare bubble growth velocities with the longitudinal and transverse sound speeds of the competing supersolid orders.

Keywords: Dipolar; Superfluid; Supersolid; Vacuum decay; Instanton