Stability of a flattened dipolar binary condensate: emergence of the spin roton

Abstract

We develop theory for a two-component miscible dipolar condensate in a planar trap. Using numerical solutions and a variational theory we solve for the excitation spectrum and identify regimes where density- and spin-roton excitations are favored. We characterize the various instabilities that can emerge in this system over a wide parameter regime and present results for the stability phase diagram. Importantly this allows us to identify the parameter regimes where a novel roton-immiscibility transition can occur, driven by the softening of the spin roton excitation.

10 pages, 6 figures

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Cited by in corpus (6)

• Two-dimensional miscible-immiscible supersolid and droplet crystal state in a homonuclear dipolar bosonic mixture
• Self-bound crystals of antiparallel dipolar mixtures
• Excitations and phase ordering of the spin-stripe phase of a binary dipolar condensate
• Coupled-cluster theory for trapped bosonic mixtures
• Roadmap to vortex nucleation below critical rotation frequency in a dipolar Bose-Einstein condensate
• Quasiparticle spectra of mixtures of dipolar and non-dipolar condensates at zero and finite temperatures