标题： 超冷玻色子在光晶格中的密度诱导几何阻挫 显示英文标题

标题： Density-induced geometric frustration of ultra-cold bosons in optical lattices

摘要： 密度依赖的规范场可能引起密度诱导的几何阻挫，导致密度调制与阻挫之间的非平凡相互作用，我们以超冷玻色子在具有密度依赖跃迁的锯齿形光晶格中的特殊情况为例进行说明。 我们表明，密度诱导的阻挫会导致丰富的量子相图，包括莫特绝缘体和键序绝缘体、两组分超流体、手性超流体以及部分配对的超流体。 我们还表明，密度依赖的跃迁会导致有效排斥或吸引相互作用，并且在后一种情况下，真空可能会被不稳定化，从而导致强压缩性。 最后，我们讨论了如何通过时间飞行测量来实验观察和表征这些预测的相，利用它们在动量分布中的特征标志。 显示英文摘要

摘要： A density-dependent gauge field may induce density-induced geometric frustration, leading to a non-trivial interplay between density modulation and frustration, which we illustrate for the particular case of ultra-cold bosons in zig-zag optical lattices with a density-dependent hopping. We show that the density-induced frustration leads in a rich landscape of quantum phases, including Mott and bond-order insulators, two-component superfluids, chiral superfluids, and partially-paired superfluids. We show as well that the density-dependent hopping results in an effective repulsive or attractive interactions, and that for the latter case the vacuum may be destabilized leading to a strong compressibility. Finally, we discuss how the predicted phases may be experimentally observed and characterized in time-of-flight measurements using their characteristic signatures in the momentum distribution.