标题： 强关联晶格偶极玻色子的超交换液化 显示英文标题

标题： Superexchange Liquefaction of Strongly Correlated Lattice Dipolar Bosons

摘要： 我们提出了一种强关联格点系统中液体形成的机制。 该机制基于长程吸引力和超交换过程之间的相互作用。 作为例子，我们研究了一维光晶格中的偶极玻色子。 我们提出了一种微扰理论，并将其与完整的密度矩阵重整化群模拟进行比较，以验证该理论在不同相态的体系的能量和结构特性，即自结合莫特绝缘体、液体和气体。 我们分析了非平衡特性并计算了动态结构因子。 其结构在可压缩相和绝缘相中有所不同。 特别是，在可压缩相中，低能激发是线性声子。 我们提取了声速并分析了其与偶极相互作用和密度的关系。 我们表明，由于伽利略不变性的破坏，它表现出非平凡的行为。 我们认为，对这种之前未知的量子液体的实验检测可以提供超交换过程的特征，并为研究非伽利略不变性液体开辟有趣的可能性。 显示英文摘要

摘要： We propose a mechanism for liquid formation in strongly correlated lattice systems. The mechanism is based on an interplay between long-range attraction and superexchange processes. As an example, we study dipolar bosons in one-dimensional optical lattices. We present a perturbative theory and validate it in comparison with full density-matrix renormalization group simulations for the energetic and structural properties of different phases of the system, i.e., self-bound Mott insulator, liquid, and gas. We analyze the nonequilibrium properties and calculate the dynamic structure factor. Its structure differs in compressible and insulating phases. In particular, the low-energy excitations in compressible phases are linear phonons. We extract the speed of sound and analyze its dependence on dipolar interaction and density. We show that it exhibits a nontrivial behaviour owing to the breaking of Galilean invariance. We argue that an experimental detection of this previously unknown quantum liquid could provide a fingerprint of the superexchange process and open intriguing possibilities for investigating non-Galilean invariant liquids.