Milloch Alessandra, Filippi Umberto, Franceschini Paolo, Galvani Michele, Mor Selene, Pagliara Stefania, Ferrini Gabriele, Banfi Francesco, Capone Massimo, Baranov Dmitry, Manna Liberato, Giannetti Claudio
Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25133, Italy.
ILAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25133, Italy.
Nano Lett. 2023 Nov 22;23(22):10617-10624. doi: 10.1021/acs.nanolett.3c03715. Epub 2023 Nov 10.
The development of quantum simulators, artificial platforms where the predictions of many-body theories of correlated quantum materials can be tested in a controllable and tunable way, is one of the main challenges of condensed matter physics. Here we introduce artificial lattices made of lead halide perovskite nanocubes as a new platform to simulate and investigate the physics of correlated quantum materials. We demonstrate that optical injection of quantum confined excitons in this system realizes the two main features that ubiquitously pervade the phase diagram of many quantum materials: collective phenomena, in which long-range orders emerge from incoherent fluctuations, and the excitonic Mott transition, which has one-to-one correspondence with the insulator-to-metal transition described by the repulsive Hubbard model in a magnetic field. Our results demonstrate that time-resolved experiments provide a quantum simulator that is able to span a parameter range relevant for a broad class of phenomena, such as superconductivity and charge-density waves.
量子模拟器的发展是凝聚态物理的主要挑战之一，量子模拟器是一种人工平台，在该平台上可以以可控和可调谐的方式测试关联量子材料多体理论的预测。在此，我们引入由卤化铅钙钛矿纳米立方体构成的人工晶格作为一个新平台，用于模拟和研究关联量子材料的物理性质。我们证明，在该系统中对量子限域激子进行光注入，实现了许多量子材料相图中普遍存在的两个主要特征：集体现象，即从非相干涨落中出现长程序；以及激子莫特转变，它与磁场中排斥性哈伯德模型所描述的绝缘体到金属的转变一一对应。我们的结果表明，时间分辨实验提供了一种量子模拟器，它能够跨越与广泛的一类现象（如超导和电荷密度波）相关的参数范围。
