# Morphological Superfluid in a Nonmagnetic Spin-2 Bose-Einstein Condensate

## TL;DR

This paper discovers a new mechanism for superfluidity in nonmagnetic spin-2 Bose-Einstein condensates, involving spatial variation of the order-parameter morphology protected by a hidden su(2) symmetry.

## Contribution

It introduces the concept of a morphological superfluid mechanism, expanding understanding of superfluidity beyond known phase gradient and spin-orbit interactions.

## Key findings

- Identifies a third superflow mechanism in spin-2 BECs.
- Highlights the role of hidden su(2) symmetry in superfluidity.
- Discusses potential experimental realizations.

## Abstract

The two known mechanisms for superflow are the gradient of the U(1) phase and the spin-orbit-gauge symmetry. We find the third mechanism, namely a spatial variation of the order-parameter morphology protected by a hidden su(2) symmetry in a nonmagnetic spin-2 Bose-Einstein condensate. Possible experimental situations are also discussed.