Spin-orbit-coupling-assisted roton softening and superstripes in a Rydberg-dressed Bose-Einstein Condensate

Abstract

Rotons can exist in ultracold atomic gases either with long-range interactions or with spin-orbitcoupled dispersions. We find that two different kinds of rotons coexist in a joint system combining long-range interactions and spin-orbit coupling. One roton originates from spin-orbit coupling and two others come from long-range interactions. Their softening can be controlled separately. The interesting new phenomenon which we find is that spin-orbit-coupled roton can push down the energy of one long-range-interaction roton. The spin-orbit coupling accelerates the softening of this roton. The post phase of spin-orbit-coupling-assisted roton softening and instability is identified as a superstripe.

arXiv commentPublished Version

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• Exciting the Goldstone Modes of a Supersolid Spin-Orbit-Coupled Bose Gas
• Elementary excitations in a spin-orbit-coupled spin-1 Bose-Einstein condensate
• Quantum phases in spin-orbit-coupled Floquet spinor Bose gases
• Emergence of unstable avoided crossing in the collective excitations of spin-1 spin-orbit coupled Bose-Einstein condensates
• Supercurrent-carrying supersolid in spin-orbit-coupled Bose-Einstein condensates
• Chiral supersolid and dissipative time crystal in Rydberg-dressed Bose-Einstein condensates with Raman-induced spin-orbit coupling
• Band-edge superfluid of Bose-Einstein condensates in the spin-orbit-coupled Zeeman lattice
• Density and pseudo-spin rotons in a bilayer of soft-core bosons
• Supersolid phase of a spin-orbit-coupled Bose-Einstein condensate: a perturbation approach