论文标题
非热者挤压极性
Non-Hermitian Squeezed Polarons
论文作者
论文摘要
在非高铁超低原子晶格中的最新实验突破使诱人的前景悬挂在实现异国情调的,迄今未报告,多体的非温和量子量子现象方面。在这项工作中,我们发现并提出了一个实验平台,用于将巨大不同的非热门现象称为polaron挤压。它的特征是在非富裕互惠跳的背景下由相互作用的杂质产生的偶极子积聚。我们计算了它们的空间密度,发现与荒原极性不同,它们围绕杂质进行了对称,非热质挤压极性子不对称地朝相反的方向定位,尽管具有显着的本地剖面,但与常规的非扰动式泵送和非扰动的变化。我们调查了他们的时间演变,发现它们几乎是在长期稳定状态下出现的,这与仅在基态下存在的Hermitian Polalon不同。在我们的数字中,我们还发现,与众所周知的拓扑或皮肤局部状态不同,挤压极性子存在于边界条件上。我们的发现可能会激发超低原子设置中多体态的实现,在该设置中,可以通过对空间费米度密度进行成像来容易检测并表征挤压的极性。
Recent experimental breakthroughs in non-Hermitian ultracold atomic lattices have dangled tantalizing prospects in realizing exotic, hitherto unreported, many-body non-Hermitian quantum phenomena. In this work, we discover and propose an experimental platform for a radically different non-Hermitian phenomenon dubbed polaron squeezing. It is marked by a dipole-like accumulation of fermions arising from an interacting impurity in a background of non-Hermitian reciprocity-breaking hoppings. We computed their spatial density and found that, unlike Hermitian polarons which are symmetrically localized around impurities, non-Hermitian squeezed polarons localize asymmetrically in the direction opposite to conventional non-Hermitian pumping and non-perturbatively modify the entire spectrum, despite having a manifestly local profile. We investigated their time evolution and found that, saliently, they appear almost universally in the long-time steady state, unlike Hermitian polarons which only exist in the ground state. In our numerics, we also found that, unlike well-known topological or skin localized states, squeezed polarons exist in the bulk, independently of boundary conditions. Our findings could inspire the realization of many-body states in ultracold atomic setups, where a squeezed polaron can be readily detected and characterized by imaging the spatial fermionic density.