Excitations of a Binary Dipolar Supersolid
W. Kirkby, Au-Chen Lee, D. Baillie, Thomas Bland, Francesca Ferlaino, P. B. Blakie, R. N. Bisset
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.
Topics & Concepts
SupersolidBinary numberDipolePhysicsCondensed matter physicsMaterials scienceStatistical physicsQuantum mechanicsPhase (matter)Phase diagramMathematicsArithmeticCold Atom Physics and Bose-Einstein CondensatesQuantum, superfluid, helium dynamicsPhysics of Superconductivity and Magnetism