论文标题
旋转轨道耦合的自旋1玻色-instein冷凝物中的基本激发
Elementary excitations in a spin-orbit-coupled spin-1 Bose-Einstein condensate
论文作者
论文摘要
虽然已经在实验中观察到了自旋轨道耦合的自旋-1玻色菌冷凝物，但在条纹期间，其基本激发尚不清楚。在这里，我们系统地研究了旋转轨道耦合的自旋1玻色-instein冷凝物的三个不同阶段的基本激发。我们发现，激发光谱以及相应的静态响应函数和结构因子在很大程度上取决于自旋轨道耦合参数，例如二次Zeeman场和RABI频率。在条纹阶段，除了两种无间隙的金石模式外，我们还显示了旋转激发的存在。最后，我们证明了这些不同阶段之间的量子相变，包括零孔，平面波和条纹相的特征是声速和量子耗尽。
While a spin-orbit-coupled spin-1 Bose-Einstein condensate has been experimentally observed, its elementary excitations remain unclear in the stripe phase. Here, we systematically study the elementary excitations in three distinct phases of a spin-orbit-coupled spin-1 Bose-Einstein condensate. We find that the excitation spectrum as well as the corresponding static response function and structure factor depend strongly on spin-orbit coupling parameters such as the quadratic Zeeman field and the Rabi frequency. In the stripe phase, besides two gapless Goldstone modes, we show the existence of roton excitations. Finally, we demonstrate that quantum phase transitions between these different phases including the zero-momentum, plane wave and stripe phases are characterized by the sound velocities and the quantum depletion.
