Flavour-selective localization in interacting lattice fermions
Flavour-selective localization in interacting lattice fermions
复制标题
相互作用的晶格费米子中的味道选择性定位
作者：
D. Tusi;L. Franchi;L. Livi;K. Baumann;Daniel Benedicto;L. Re;R. Barfknecht;Tianwei Zhou;M. Inguscio;G. Cappellini;M. Capone;J. Catani;L. Fallani
量子系统中粒子之间的大斥力可以导致它们的局域化，这是强关联材料中莫特绝缘体相的原因。在具有多轨道的系统中，可以形成轨道选择性莫特绝缘体，其中某些轨道中的电子被预测为局部化，而其他轨道保持巡回。在这里，我们通过观察基于原子的量子模拟器中的味道选择性定位来展示这种现象的更一般版本。我们的实验实现了具有SU（3）对称性的费米-哈伯德模型，该模型可以使用味道之间的可调谐耦合来打破。我们观察到一个选择性的莫特过渡和出现的风味依赖的相关性与本地化的增强。我们实现的味道选择莫特物理演示了冷原子模拟相互作用的多组分材料，如超导体和拓扑绝缘体的潜力。当粒子之间的强相互作用使它们局部化时，莫特绝缘体就形成了。一个冷原子模拟器现在已经被用来实现一个选择性的莫特绝缘体中的原子局域化或传播取决于它们的自旋状态。
A large repulsion between particles in a quantum system can lead to their localization, an effect responsible for the Mott insulator phases in strongly correlated materials. In a system with multiple orbitals, an orbital-selective Mott insulator can form, where electrons in some orbitals are predicted to localize while others remain itinerant. Here we demonstrate a more general version of this phenomenon by observing flavour-selective localization in an atom-based quantum simulator. Our experiment realizes Fermi–Hubbard models with an SU(3) symmetry that can be broken using a tunable coupling between flavours. We observe an enhancement of the localization associated with a selective Mott transition and the emergence of flavour-dependent correlations. Our realization of flavour-selective Mott physics demonstrates the potential of cold atoms to simulate interacting multicomponent materials such as superconductors and topological insulators. A Mott insulator forms when strong interactions between particles cause them to become localized. A cold atom simulator has now been used to realize a selective Mott insulator in which atoms are localized or propagating depending on their spin state.