论文标题
旋转二维Bose-凝结式凝结物中的不稳定性：量化涡流的稳定性的新观点
Ergoregion instabilities in rotating two-dimensional Bose--Einstein condensates: new perspectives on the stability of quantized vortices
论文作者
论文摘要
我们研究了二维玻色 - 国家凝结物中涡流的稳定性。与旋转的空间相比，我们仔细地说明了边界条件，我们表明，被困的冷凝水中乘数量化涡流的动力不稳定性持续存在于未经捕获的，空间均匀的几何形状中，并且由于bogoliubov sound的特殊分散而具有一些修饰。我们的结果开放了对陷阱冷凝物中涡流物理的新视角，在该冷凝物中，可以通过干扰效应稳定乘积量化的涡旋，并且在适当设计的陷阱电位中可能会变得不稳定。我们展示了如何在动态不稳定系统的短时动力学中观察到超级散射，从而在空间有限的系统中提供了动态（IN）稳定现象的另一种观点。
We investigate the stability of vortices in two-dimensional Bose--Einstein condensates. In analogy with rotating spacetimes and with a careful account of boundary conditions, we show that the dynamical instability of multiply quantized vortices in trapped condensates persists in untrapped, spatially homogeneous geometries and has an ergoregion nature with some modification due to the peculiar dispersion of Bogoliubov sound. Our results open new perspectives to the physics of vortices in trapped condensates, where multiply quantized vortices can be stabilized by interference effects and singly charged vortices can become unstable in suitably designed trap potentials. We show how superradiant scattering can be observed also in the short-time dynamics of dynamically unstable systems, providing an alternative point of view on dynamical (in)stability phenomena in spatially finite systems.
