论文标题
一维偶极超胚膜的地面稳定性和激发光谱
Ground-state stability and excitation spectrum of a one-dimensional dipolar supersolid
论文作者
论文摘要
我们研究了从二维几何几何形状限制的偶极杆气体的超氟化相的量子相跨量子相变的刺激光谱的行为。该分析包括在有效的哈密顿量中的领先均值场效应，基于Bogoliubov理论，其几个顺序参数占超流体和固体结构。我们发现，在超固体中，地下能量的快速收敛具有订单参数的数量，并在低能量状态下展示了具有两种金石模式的稳定激发光谱和振幅模式。我们的结果表明，存在一个可以实验可实现的参数，用于肾上腺原子，其中超固体相在热力学极限中表现出稳定的激发光谱，并且向超级固体的过渡是由Roton不稳定性驱动的二阶。
We study the behavior of the excitation spectrum across the quantum phase transition from a superfluid to a supersolid phase of a dipolar Bose gas confined to a one-dimensional geometry. Including the leading beyond-mean-field effects within an effective Hamiltonian, the analysis is based on Bogoliubov theory with several order parameters accounting for the superfluid as well as solid structure. We find fast convergence of the ground-state energy in the supersolid with the number of order parameters and demonstrate a stable excitation spectrum with two Goldstone modes and an amplitude mode in the low-energy regime. Our results suggest that there exists an experimentally achievable parameter regime for dysprosium atoms, where the supersolid phase exhibits a stable excitation spectrum in the thermodynamic limit and the transition into the supersolid phase is of second order driven by the roton instability.
