Kasamatsu Kenichi, Tsubota Makoto
Department of General Education, Ishikawa National College of Technology, Tsubata, Ishikawa 929-0392, Japan.
Phys Rev Lett. 2006 Dec 15;97(24):240404. doi: 10.1103/PhysRevLett.97.240404. Epub 2006 Dec 13.
We present simulation results of the vortex dynamics in a trapped Bose-Einstein condensate in the presence of a rotating optical lattice. Changing the potential amplitude and the relative rotation frequency between the condensate and the optical lattice, we find a rich variety of dynamical phases of vortices. The onset of these different phases is described by the force balance of a driving force, a pinning force, and vortex-vortex interactions. In particular, when the optical lattice rotates faster than the condensate, an incommensurate effect leads to a vortex-liquid phase supported by the competition between the driving force and the dissipation.
我们展示了在存在旋转光学晶格的捕获玻色 - 爱因斯坦凝聚体中涡旋动力学的模拟结果。通过改变势场振幅以及凝聚体与光学晶格之间的相对旋转频率，我们发现了丰富多样的涡旋动力学相。这些不同相的起始由驱动力、钉扎力和涡旋 - 涡旋相互作用的力平衡来描述。特别地，当光学晶格比凝聚体旋转得更快时，失配效应会导致在驱动力和耗散之间的竞争支持下的涡旋液相。
