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arXiv · 2312.03390

Excitations of a binary dipolar supersolid

W. Kirkby·Au-Chen Lee·D. Baillie·T. Bland·F. Ferlaino·P. B. Blakie·R. N. Bisset
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Abstract

We predict a rich excitation spectrum of a binary dipolar supersolid in a linear crystal geometry, where the ground state consists of two partially immiscible components with alternating, interlocking domains. We identify three Goldstone branches, each with first-sound, second-sound or spin-sound character. In analogy with a diatomic crystal, the resulting lattice has a two-domain primitive basis and we find that the crystal (first-sound-like) branch is split into optical and acoustic phonons. We also find a spin-Higgs branch that is associated with the supersolid modulation amplitude.

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W. Kirkby, Au-Chen Lee, D. Baillie, T. Bland, F. Ferlaino, P. B. Blakie, R. N. Bisset. 2023-12-06. Excitations of a binary dipolar supersolid. https://doi.org/10.1103/physrevlett.133.103401

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