标题： 多粒子量子行走在偶极子守恒的玻色-哈伯德模型中 显示英文标题

标题： Multi-Particle Quantum Walks in a Dipole-Conserving Bose-Hubbard Model

摘要： 当粒子通过晶体或光晶格运动时，它们的运动有时会因强外部力而被冻结——但通过微妙的多体效应，集体运动仍可能显现。 在本工作中，我们通过实现一个偶极守恒的玻色-哈伯德模型来研究这种受约束的动力学，其中单个原子是静止的，但粒子对可以协同移动，同时保持系统的质心，即粒子分布的整体偶极矩。 从一维光晶格中的超冷玻色子原子链出发，我们使用位点分辨的光学势生成由一个空穴和一个双占据态组成的局域偶极激发，并表征它们的量子行走和散射动力学。 我们的研究提供了对具有动能约束的哈密顿量的自下而上调查，并为在现有实验平台中探索分形物质的低能相铺平了道路。 显示英文摘要

摘要： When particles move through a crystal or optical lattice, their motion can sometimes become frozen by strong external forces -- yet collective motion may still emerge through subtle many-body effects. In this work, we explore such constrained dynamics by realizing a dipole-conserving Bose-Hubbard model, where single atoms are immobile but pairs of particles can move cooperatively while preserving the system's center of mass, i.e. the overall dipole moment of the particle distribution. Starting from a one-dimensional chain of ultracold bosonic atoms in an optical lattice, we generate localized dipole excitations consisting of a hole and a doublon using site-resolved optical potentials and characterize their quantum walks and scattering dynamics. Our study provides a bottom-up investigation of a Hamiltonian with kinetic constraints, and paves the way for exploring low-energy phases of fractonic matter in existing experimental platforms.