论文标题
质量受损的费米极性子中晶体的几个体体相关的出现
Emergence of Crystalline Few-body Correlations in Mass-imbalanced Fermi Polarons
论文作者
论文摘要
极地子可以用作理想的平台，以识别解决复杂多体问题的几个体型相关性。在这项工作中，我们揭示了各种结晶的几体相关性在二维中从质量受损的费米极化物中平稳地出现。统一的变化接近最多三个粒子孔激发使我们能够在单个框架中提取主要的二聚体，三聚体或四聚体相关性。当费米（Fermion Imberity）质量比超出某些临界值时，发现费米极性（Fermi Polaron）会经历光滑的跨界，而不是从偏振子到三聚体和四聚体方案的急剧过渡，因为增强了费米恩 - 障碍性吸引力。出现的三聚体和四聚体相关性导致粒子孔激发的动量空间结晶，具有稳定的对角线或三角形结构，可以通过多数费米的密度密度相关性直接探测。我们的结果揭示了对超出配对超流体范式以外的质量受损的Fermi Fermi混合物中有趣的量子相。
Polarons can serve as an ideal platform to identify few-body correlations in tackling complex many-body problems. In this work, we reveal various crystalline few-body correlations smoothly emergent from the mass-imbalanced Fermi polarons in two dimensions. A unified variational approach up to three particle-hole excitations allows us to extract the dominant dimer, trimer or tetramer correlation in a single framework. When the fermion-impurity mass ratio is beyond certain critical value, the Fermi polaron is found to undergo a smooth crossover, instead of a sharp transition, from the polaronic to trimer and tetramer regimes as increasing the fermion-impurity attraction. The emergent trimer and tetramer correlations result in the momentum-space crystallization of particle-hole excitations featuring a stable diagonal or triangular structure, as can be directly probed through the density-density correlation of majority fermions. Our results shed light on the intriguing quantum phases in the mass-imbalanced Fermi-Fermi mixtures beyond the pairing superfluid paradigm.
