Commensurate and incommensurate 1D interacting quantum systems.
Commensurate and incommensurate 1D interacting quantum systems.
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DOI：
10.1038/s41467-023-44610-3
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发表时间：
2024-01-11
影响因子：
16.6
通讯作者：
Kuhr, Stefan
中科院分区：
文献类型：
--
作者：
Di Carli, Andrea;Parsonage, Christopher;La Rooij, Arthur;Koehn, Lennart;Ulm, Clemens;Duncan, Callum W.;Daley, Andrew J.;Haller, Elmar;Kuhr, Stefan
光学晶格中多体量子系统的单原子成像分辨率通常是通过量子气体显微镜实现的。作为量子模拟器，其多功能性的关键是能够在微观水平上使用工程光势。在这里，我们在量子气体显微镜中采用动态变化的微观光势来研究相互作用的玻色铷原子的相称和不相称一维系统。这种不相称的系统类似于表现出原子传输和可压缩性的掺杂绝缘态。最初，在两个势垒之间制备具有单位填充和固定原子数的相称系统。我们通过动态改变势垒的位置来确定性地创建一个不相称的系统，从而在保留原子数的同时减少可用晶格位点的数量。我们的系统的特点是测量颗粒和孔洞的分布作为晶格填充和相互作用强度的函数，并且我们通过施加偏置电势来探测颗粒迁移率。我们的工作为光学晶格实验中控制填充的低熵态的制备提供了基础。作者展示了一种控制 Rb 原子掺杂一维 Bose-Hubbard 系统晶格填充的方法，该系统由光学晶格中 3 至 6 个位点的链组成。通过改变光势和相互作用强度来实现控制。
Single-atom imaging resolution of many-body quantum systems in optical lattices is routinely achieved with quantum-gas microscopes. Key to their great versatility as quantum simulators is the ability to use engineered light potentials at the microscopic level. Here, we employ dynamically varying microscopic light potentials in a quantum-gas microscope to study commensurate and incommensurate 1D systems of interacting bosonic Rb atoms. Such incommensurate systems are analogous to doped insulating states that exhibit atom transport and compressibility. Initially, a commensurate system with unit filling and fixed atom number is prepared between two potential barriers. We deterministically create an incommensurate system by dynamically changing the position of the barriers such that the number of available lattice sites is reduced while retaining the atom number. Our systems are characterised by measuring the distribution of particles and holes as a function of the lattice filling, and interaction strength, and we probe the particle mobility by applying a bias potential. Our work provides the foundation for preparation of low-entropy states with controlled filling in optical-lattice experiments. The authors demonstrate a method controlling the lattice filling of doped 1D Bose-Hubbard system of Rb atoms composed of chains of 3 to 6 sites in an optical lattice. The control is achieved by changing of the light potential and interaction strength.
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