Excitation Spectrum of a Trapped Dipolar Supersolid and Its Experimental Evidence.

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2019
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Abstract
We study the spectrum of elementary excitations of a dipolar Bose gas in a three-dimensional anisotropic trap across the superfluid-supersolid phase transition. Theoretically, we show that, when entering the supersolid phase, two distinct excitation branches appear, respectively associated with dominantly crystal and superfluid excitations. These results confirm infinite-system predictions, showing that finite-size effects play only a small qualitative role, and connect the two branches to the simultaneous occurrence of crystal and superfluid orders. Experimentally, we probe compressional excitations in an Er quantum gas across the phase diagram. While in the Bose-Einstein condensate regime the system exhibits an ordinary quadrupole oscillation, in the supersolid regime we observe a striking two-frequency response of the system, related to the two spontaneously broken symmetries.
Reference Key
natale2019excitationphysical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Natale, G;van Bijnen, R M W;Patscheider, A;Petter, D;Mark, M J;Chomaz, L;Ferlaino, F;
Journal physical review letters
Year 2019
DOI
10.1103/PhysRevLett.123.050402
URL
Keywords
bose-einstein condensate condensed matter physics fluid dynamics superradiance vortex

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