Evidence of superfluidity in a dipolar supersolid from non-classical rotational inertia

Understand

A key manifestation of superfluidity in liquids and gases is a reduction of the moment of inertia under slow rotations.

• Non-classical rotational effects have been searched for a long time also for the elusive supersolid phase of matter, in which superfluidity coexists with a lattice structure.
• Here we show that the recently discovered supersolid phase in dipolar quantum gases features a reduced moment of inertia.
• We study a peculiar rotational oscillation mode in a harmonic potential, the scissors mode, already employed for superfluids.