Biomedical subjects

Yuki Kawaguchi

Publications and source records attributed to Yuki Kawaguchi.

3 recordsLinked to original sources

PubMed2006

Spontaneous circulation in ground-state spinor dipolar Bose-Einstein condensates.

We report on a study of the spin-1 ferromagnetic Bose-Einstein condensate with magnetic dipole-dipole interactions. By solving the nonlocal Gross-Pitaevskii equations for this system, we find three ground-state phases. Moreover, we show that a substantial orbital angular momentum accompanied by chiral symmetry breaking emerges spontaneously in a certain parameter regime. We predict that all these phases can be observed in the spin-1 87Rb condensate by changing the number of atoms or the trap frequency.

Journal Article↗

PubMed2006

Einstein-de Haas effect in dipolar Bose-Einstein condensates.

The general properties of the order parameter for a dipolar spinor Bose-Einstein condensate are discussed based on symmetries of interactions. An initially spin-polarized dipolar condensate is shown to dynamically generate a nonsingular vortex via spin-orbit interactions--a phenomenon reminiscent of the Einstein-de Haas effect in ferromagnets.

Journal Article↗

PubMed2006

Breaking of chiral symmetry and spontaneous rotation in a spinor Bose-Einstein condensate.

We show that a spin-1 Bose-Einstein condensate with ferromagnetic interactions spontaneously generates a topological spin texture, in which the m = +/- 1 components of the magnetic sublevels form vortices with opposite circulations. This phenomenon originates from an interplay between ferromagnetic interactions and spin conservation.

Journal Article↗