Condensing magnons in a degenerate ferromagnetic spinor Bose gas

Abstract

We observe the condensation of magnon excitations within an $F=1$ ${}^{87}$Rb spinor Bose-Einstein condensed gas. Magnons are pumped into a longitudinally spin-polarized gas, allowed to equilibrate to a non-degenerate distribution, and then cooled evaporatively at near-constant net longitudinal magnetization whereupon they condense. We find magnon condensation to be described quantitatively as the condensation of free particles in an effective potential that is uniform within the ferromagnetic condensate volume, evidenced by the number and distribution of magnons at the condensation transition. Transverse magnetization images reveal directly the spontaneous, inhomogeneous symmetry breaking by the magnon quasi-condensate, including signatures of Mermin-Ho spin textures that appear as phase singularities in the magnon condensate wavefunction.

arXiv comment5 pages, 3 figures

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• Optomagnonics in Magnetic Solids
• Brownian motion of solitons in a Bose-Einstein Condensate
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• Many-body interferometry of magnetic polaron dynamics
• Effective interactions in a quantum Bose-Bose mixture
• Pump-power-driven mode switching in a microcavity device and its relation to Bose-Einstein condensation
• Bose-Einstein condensation of magnons and spin superfluidity in the polar phase of ${}^3$He
• Stepwise Bose-Einstein condensation in a spinor gas
• Competition between Bose Einstein Condensation and spin dynamics
• Thermally-robust spin correlations between two 85Rb atoms in an optical microtrap
• Spinor dynamics in a mixture of spin-1 and spin-2 Bose-Einstein condensates
• Magnon Bose-Einstein condensates: from time crystals and quantum chromodynamics to vortex sensing and cosmology
• Spin and mass superfluidity in ferromagnetic spin-1 Bose-Einstein condensate
• Superfluidity and spin superfluidity in spinor Bose gases
• Magnon Condensation in Dimerized Antiferromagnets with Spin-Orbit Coupling
• Exploring the thermodynamics of spin-1 ${}^{87}$Rb Bose Gases with synthetic magnetization
• Motion of vortices in ferromagnetic spin-1 BEC