搬一下原文abstract和ds的翻译

Abstract
A supersolid is a counter-intuitive phase of matter in which its constituent particles are arranged into a crystalline structure, yet they are free to flow without friction. This requires the particles to share a global macroscopic phase while being able to reduce their total energy by spontaneous, spatial self-organization. The existence of the supersolid phase of matter was speculated more than 50years ago1,2,3,4. However, only recently has there been convincing experimental evidence, mainly using ultracold atomic Bose–Einstein condensates (BECs) coupled to electromagnetic fields. There, various guises of the supersolid were created using atoms coupled to high-finesse cavities5,6, with large magnetic dipole moments7,8,9,10,11,12,13, and spin–orbit-coupled, two-component systems showing stripe phases14,15,16. Here we provide experimental evidence of a new implementation of the supersolid phase in a driven-dissipative, non-equilibrium context based on exciton–polaritons condensed in a topologically non-trivial, bound state in the continuum (BiC) with exceptionally low losses, realized in a photonic-crystal waveguide. We measure the density modulation of the polaritonic state indicating the breaking of translational symmetry with a precision of several parts in a thousand. Direct access to the phase of the wavefunction allows us to also measure the local coherence of the supersolid. We demonstrate the potential of our synthetic photonic material to host phonon dynamics and a multimode excitation spectrum.
### 摘要
超固态是一种反直觉的物质相态,其组成粒子既排列成晶体结构,又能无摩擦地自由流动。这要求粒子在自发空间自组织以降低总能量的同时,共享全局宏观相位。超固态的存在在50多年前便引发理论猜想???,但直到近年才在超冷原子玻色-爱因斯坦凝聚体(BEC)与电磁场耦合的实验中取得突破性证据。此前实现方案包括:光腔耦合原子体系?,?、强磁偶极相互作用体系????,以及显示条纹相的自旋轨道耦合双组分体系?????。本文报道了基于激子极化激元在拓扑非平庸的连续体束缚态(BiC)中凝聚的非平衡超固态新范式——该态依托光子晶体波导实现,具有极低损耗。我们以千分之几的精度测量了表征平移对称性破缺的密度调制,并通过波函数相位的直接观测验证了局域相干性。实验还揭示了该合成光子材料中声子动力学与多模激发谱的潜力,展现了超固态兼具晶格序与超流相位的双重特性。