基于极化激元超流体的涡旋拓扑吸引子作为时钟发生器
A topological attractor of vortices as a clock generator based on polariton superfluids
AI总结：
本文研究极化激元超流体中由涡旋动力学形成的拓扑吸引子，揭示其作为双稳态时钟发生器可在两个GHz频段稳定振荡，并通过泵浦调控实现状态切换。
摘要：
我们揭示了一种受拓扑保护的极化激元超流体持续振荡动力学，该超流体在平面半导体微腔中受到外部C形势的作用，并由超高斯激光束非共振驱动。我们发现持续振荡以拓扑吸引子为特征，其基础是小约瑟夫森涡旋绕中心涡旋外边缘旋转的动力学行为。该吸引子由于逆能量级联伴随不可压缩动能的增长而形成。该吸引子对扰动表现出显著的稳定性，并且可以通过泵浦激光强度调谐到两个不同的频率范围：20.16±0.14 GHz和48.4±1.2 GHz。由于涡旋的手性，该吸引子是双稳态的。两个稳定状态之间的切换通过改变泵浦功率或添加额外的非相干高斯泵浦光束来实现。
英文摘要：
We reveal a topologically protected persistent oscillatory dynamics of a polariton superfluid, which is driven non-resonantly by a super-Gaussian laser beam in a planar semiconductor microcavity subjected to an external C-shape potential. We find persistent oscillations, characterized by a topological attractor, that are based on the dynamical behavior of small Josephson vortices rotating around the outside edge of the central vortex. The attractor is being formed due to the inverse energy cascade accompanied by the growth of the incompressible kinetic energy. The attractor displays a remarkable stability towards perturbations and it may be tuned by the pump laser intensity to two distinct frequency ranges: 20.16$\pm$0.14 GHz and 48.4$\pm$1.2 GHz. This attractor is bistable due to the chirality of the vortex. The switching between two stable states is achieved by altering the pump power or by adding an extra incoherent Gaussian pump beam.
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