标题： 在受挫的三角光晶格中的超流-莫特转变 显示英文标题

标题： Superfluid-Mott transition in a frustrated triangular optical lattice

摘要： 几何挫折可以显著增加多体物理的复杂性和丰富性，并且例如会抑制量子磁体中的反铁磁序。 在这里，我们使用超冷玻色子$^{39}$K 原子在三角光晶格中研究几何挫折，通过负绝对温度稳定气体在受挫的上能带边缘。 我们发现几何挫折使 (手性-)超流体到莫特绝缘体 ($\chi$-SF-MI) 量子相变的关键相互作用强度降低了 2.7(3) 倍，并且进一步改变了相变的关键动力学。 尽管在从 MI 快速加速到 ($\chi$-)SF 范围期间相干性的出现在两种情况下都是连续的，但对于超过几个隧穿时间的加速，会出现显著差异。 在\frs 情况下，在所研究的时间尺度上没有出现长程序，突显出出现相干性的速率显著降低甚至饱和。 这项工作为受挫系统的量子模拟打开了大门，这些系统通常难以通过经典模拟处理。 显示英文摘要

摘要： Geometric frustration can significantly increase the complexity and richness of many-body physics and, for instance, suppress antiferromagnetic order in quantum magnets. Here, we employ ultracold bosonic $^{39}$K atoms in a triangular optical lattice to study geometric frustration by stabilizing the gas at the frustrated upper band edge using negative absolute temperatures. We find that geometric frustration suppresses the critical interaction strength for the (chiral-)superfluid to Mott insulator ($\chi$-SF-MI) quantum phase transition by a factor of 2.7(3) and furthermore changes the critical dynamics of the transition. Although the emergence of coherence during fast ramps from MI to the ($\chi$-)SF regime is continuous in both cases, for ramps longer than a few tunnelling times, significant differences emerge. In the \frs case, no long-range order emerges on the studied timescales, highlighting a significantly reduced rate or even saturation of the emerging coherence. This work opens the door to quantum simulations of frustrated systems that are often intractable by classical simulations.