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Special CMT Seminar: Quantum gas microsocopy of Fermi-Hubbard systems
Joannis Koepsell, MPQ Garching
29.01.2020 at 12:00
Abstract: The 2D Fermi-Hubbard model is one of the most prominent models to study phenomena of strongly-correlated matter, like high temperature superconductivity in the cuprates. Yet, the phases emerging upon doping in these systems are poorly understood. Our quant um gas microscope simultaneously resolves the density and spin of Fermi -Hubbard systems with single-particle resolution. This allows for a new approach to study the physics of strongly - correlated matter with almost arbitrary density and spin correlators. I n the weak particle- doping regime in two-dimensions and at temperatures around the superexchange energy, we reveal the dressing of dopants by a cloud of distorted magnetism, confirming the real - space picture of a magnetic polaron [1]. This confinement effe ct is in stark contrast to spin- charge separation in 1D systems, in which we track the independent dynamics of charge and spin excitations [2]. To study the fate of polarons upon higher doping and colder temperatures, we recently upgraded our apparatus with bilayer readout. This allows our machine to produce larger 2D systems with higher energy scales, enables advanced entropy redistribution techniques as well as the study of bilayered systems. [1] J. Koepsell et al., Nature 572, 2019 [2] J. Vijayan, P. Sompet et al., Science 367, 2020
A 450, Theresienstr. 37