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Soliton Collision in a Ferromagnetic Spin Chain Driven by a Magnetic Field

Chinese Physics Letters 2004年第3期21卷 443-446页

作者：李再东李录梁九卿 instituteoftheoreticalphysicsanddepartmentofphysics ShanxiUniversityTaiyuan030006

By employing an inverse-scattering transformation, the exact solution of an N-soliton train in the spin chain with a time-dependent magnetic field is derived. As a special case the one-soliton solution (N = 1) exhibits explicitly the spin precession around the magnetic field and periodic shape-variation induced by the time varying field as well. In terms of the general solution, the inelastic two-soliton collision is analysed. The inelastic collision, by which we mean the soliton shape-change before and after collision, appears generally due to the time varying field.

关键词： Solitons

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Controllable Persistent Atom Current of Bose-Einstein Condensates in an Optical Lattice Ring

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Communications in Theoretical Physics 2005年第5期43卷 819-822页

作者： ZHENGGong-Ping LIANGJiu-Qing instituteoftheoreticalphysicsanddepartmentofphysics ShanxiUniversityTaiyuan030006China

In this paper the macroscopic quantum state of Bose-Einstein condensates in optical lattices is studied by solving the periodic Gross-Pitaevskii equation in one-dimensional geometry. It is shown that an exact solution seen to be a travelling wave of excited macroscopic quantum states resultes in a persistent atom current, which can be controlled by adjusting of the barrier height of the optical periodic potential. A critical condition to generate the travelling wave is demonstrated and we moreover propose a practical experiment to realize the persistent atom current in a toroidal atom waveguide.

关键词： Bose-Einstein condensate persistent atom current

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Bifurcation of a periodic instanton and quantum－classical transition in the biaxial nano－ferromagnet with a magnetic field along hard axis

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Chinese Physics B 2003年第8期12卷 905-910页

作者：聂一行李志坚梁九卿严启伟 DepartmentofPhvsics.YanbeiNormalInstitute.Datong037000.China instituteoftheoreticalphysicsanddepartmentofphysics ShanxiUniversityTaiyuan030006China InstituteofPhysics ChineseAcademyofSciencesBeljlng100080China

Crossover from classical to quantum regimes of the barrier transition rate in a biaxial ferromagnetic magnet with a magnetic field applied along hard anisotropy axis is investigated. We show that the type of action-temperature diagrams can be determined by counting the number of bifurcation points. The model possesses not only the known type Ⅰ and Ⅱ, but also the interesting type Ⅲ and Ⅳ of transition which do not occur in general.

关键词： quantum tunnelling phase transition

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