一维光学超晶格中物质波孤子的可控泵浦
Controlled pumping of matter-wave solitons in a one-dimensional optical superlattice
AI总结：
本文研究一维光学超晶格中BEC物质波孤子的可控泵浦，发现通过调节晶格参数可在整数/分数泵浦与俘获间切换，并用经典质心运动方程有效描述该行为。
摘要：
我们研究了在具有吸引相互作用的玻色-爱因斯坦凝聚体（BECs）中形成的物质波孤子的泵浦现象，这些凝聚体被装载到光学超晶格中，其中一个晶格相对于另一个晶格运动。我们发现，孤子在浅晶格和深晶格中都表现出非常相似的泵浦特性，并且对于完全相同初始激发的孤子，只需调节晶格参数即可实现整数（分数）泵浦与俘获之间的切换。此外，我们发现从半无限带隙中最低能带分岔出来的带隙孤子也表现出这种依赖于晶格参数的泵浦与俘获行为。将孤子视为具有有效质心运动方程的经典粒子，能够很好地描述这种参数依赖的孤子整数（分数）泵浦与俘获现象。
英文摘要：
We study the pumping of matter-wave solitons formed in Bose-Einstein condensates (BECs) with attractive atomic interactions that are loaded into optical superlattices in which one of the lattices is moving with respect to the other. We find that solitons exhibit the remarkably similar pumping properties in both shallow and deep lattices, and that for exactly the same soliton initially excited, switching between integer (fractional) pumping and trapping can be achieved by simply adjusting the lattice parameters. In addition, we find that the gap solitons, which bifurcate from the lowest energy band in a semi-infinite band gap, also exhibit this lattice-parameter-dependent pumping and trapping. The treatment of solitons as classical particles with effective centre-of-mass equations of motion provides a good description of this parameter-dependent integer (fractional) pumping and trapping of solitons.
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