抛物阱中矢量物质波孤子的逃逸
An escape of vector matter-wave soliton from a parabolic trap
摘要：
我们证明了在光晶格中的玻色-爱因斯坦凝聚体中的矢量物质波孤子可以从抛物势形成的陷阱中逃逸，类似于霍金辐射。在有效质量符号相反的二分量玻色-爱因斯坦凝聚体中，粒子-反粒子对被低振幅亮-亮孤子模拟。结果表明，抛物势导致BEC分量的空间分离。在半无限隙中，一个具有化学势的组分产生周期性振荡，而另一个具有负有效质量的BEC组分则从陷阱中逃逸。讨论了原子通过空间周期线性耦合从一个BEC组分转移到另一个BEC组分的机制。
英文摘要：
We show that a vector matter-wave soliton in Bose-Einstein condensate loaded into an optical lattice can escape from a trap formed by a parabolic potential, resembling a Hawking emission. The particle-antiparticle pair is emulated by a low-amplitude bright-bright soliton in two-component Bose-Einstein condensate with effective masses of opposite signs. It is shown that the parabolic potential leads to a spatial separation of BEC components. One component with chemical potential in a semi-infinite gap exerts periodical oscillations, while the other BEC component, with negative effective mass, escapes from the trap. The mechanism of atoms transfer from one BEC component to another by spatially periodic linear coupling term is discussed.
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