Acta Medica Okayama7312006Sound velocity and multibranch bogoliubov spectrum of an elongated fermi superfluid in the BEC-BCS crossoverENTarun KantiGhoshKazushigeMachidaWe study properties of excited states of an elongated Fermi superfluid along the Bose-Einstein-condensate-BCS crossover including the unitarity limit. Analytic expressions for the sound velocity in an inhomogeneous as well as homogeneous Fermi superfluid along the crossover are obtained on the basis of the hydrodynamic theory. The complete excitation spectrum of axial quasiparticles with various discrete radial nodes is presented. We discuss the feasibility of measuring the sound velocity and the multibranch Bogoliubov spectrum experimentally.No potential conflict of interest relevant to this article was reported.American Physical SocietyActa Medica Okayama2469-99268412011Textures of F = 2 spinor Bose-Einstein condensates with spin-orbit coupling011607ENTakutoKawakamiDepartment of Physics, Okayama UniversityTakeshiMizushimaDepartment of Physics, Okayama UniversityKazushigeMachidaDepartment of Physics, Okayama University We study the textures of F = 2 spinor Bose-Einstein condensates (BECs) with spin-orbit coupling (SOC) induced by a synthetic non-Abelian gauge field. On the basis of the analysis of the SOC energy and the numerical calculation of the Gross-Pitaevskii equation, we demonstrate that the textures originate from the helical modulation of the order parameter (OP) due to the SOC. In particular, the cyclic OP consists of two-dimensional lattice textures, such as the hexagonal lattice and the 1/3 vortex lattice, commonly understandable as the two-dimensional network of the helical modulations.No potential conflict of interest relevant to this article was reported.