# Self-bound Doubly-Dipolar Bose-Einstein condensates

## TL;DR

This paper investigates self-bound droplets in doubly dipolar Bose-Einstein condensates with electric and magnetic dipoles, revealing how anisotropic interactions enable a dimensional crossover without external confinement.

## Contribution

It introduces the concept of self-bound droplets in doubly dipolar BECs and demonstrates a novel interaction-driven dimensional crossover.

## Key findings

- Anisotropic interaction potential depends on dipole orientation and strength.
- Dimensional crossover from quasi-1D to quasi-2D driven solely by interactions.
- Potential for exploring new quantum many-body physics.

## Abstract

We analyze the physics of self-bound droplets in a doubly dipolar Bose-Einstein condensate (DDBEC) composed by particles with both electric and magnetic dipole moments. Using the particularly relevant case of dysprosium, we show that the anisotropy of the doubly-dipolar interaction potential is highly versatile and nontrivial, depending critically on the relative orientation and strength between the two dipole moments. This opens novel possibilities for exploring intriguing quantum many-body physics. Interestingly, by varying the angle between the two dipoles we find a dimensional crossover from quasi one-dimensional to quasi two-dimensional self-bound droplets. This opens a so far unique scenario in condensate physics, in which a dimensional crossover is solely driven by interactions in the absence of any confinement.