论文标题
在有限温度下三角晶格中玻色子的阶段和集体模式：簇平均现场研究
Phases and collective modes of bosons in a triangular lattice at finite temperature: A cluster mean field study
论文作者
论文摘要
通过在非立我们的晶格中实现Bose-Einstein凝结物（BEC）的动机，在这项工作中，我们研究了在有限温度下使用平均值（MF）和群集平均场（CMF）理论，在有限温度下，在有限温度下，在有限温度下与邻居相互作用的玻色子的相位和集体激发。我们计算用于铁杆和软核玻色子的有限温度相图，并通过使用CMF方法系统地系统地分析了由于晶格的挫败感和相互作用而产生的相关性的效果。在MF Landau理论的框架内得出了不同阶段之间过渡温度的半分析估计，尤其是对于铁杆玻色子。除了通常的阶段，例如密度波（DW）和超氟（SF）之外，我们还表征了不同的超olid（SS）。这些阶段及其在有限温度下的过渡是从集体模式中确定的。在正在进行的冷原子实验中，可以检测到低谎言的激发，尤其是超固体的戈德石和希格斯模式。
Motivated by the realization of Bose-Einstein condensates (BEC) in non-cubic lattices, in this work we study the phases and collective excitation of bosons with nearest neighbor interaction in a triangular lattice at finite temperature, using mean field (MF) and cluster mean field (CMF) theory. We compute the finite temperature phase diagram both for hardcore and softcore bosons, as well analyze the effect of correlation arising due to lattice frustration and interaction systematically using CMF method. A semi-analytic estimate of the transition temperatures between different phases are derived within the framework of MF Landau theory, particularly for hardcore bosons. Apart from the usual phases such as density waves (DW) and superfluid (SF), we also characterize different supersolids (SS). These phases and their transitions at finite temperature are identified from the collective modes. The low lying excitations, particularly Goldstone and Higgs modes of the supersolid can be detected in the ongoing cold atom experiments.
