Can angular oscillations probe superfluidity in dipolar supersolids?

TL;DR

This study investigates the effectiveness of angular oscillations as a probe for superfluidity in dipolar supersolids with 2D structures, revealing limitations in their sensitivity compared to linear configurations.

Contribution

The paper demonstrates that angular oscillation measurements are not always reliable indicators of superfluidity in 2D dipolar supersolids, challenging previous assumptions based on linear systems.

Findings

Angular oscillation frequency remains nearly unchanged despite changes in superfluidity.

Experimental and simulation results show limited sensitivity of angular oscillations to superfluid properties.

Angular oscillations are not a robust probe for superfluidity in 2D dipolar supersolids.

Abstract

Angular oscillations can provide a useful probe of the superfluid properties of a system. Such measurements have recently been applied to dipolar supersolids, which exhibit both density modulation and phase coherence, and for which robust probes of superfluidity are particularly interesting. So far, these investigations have been confined to linear droplet arrays. Here, we explore angular oscillations in systems with 2D structure, which in principle have greater sensitivity to superfluidity. Surprisingly, in both experiment and simulation, we find that the frequency of angular oscillations remains nearly unchanged even when the superfluidity of the system is altered dramatically. This indicates that angular oscillation measurements do not always provide a robust experimental probe of superfluidity with typical experimental protocols.