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DTSTAMP:20261024T083703Z
UID:3482d6d9-01ef-4b26-b6ff-11154ed6b022
DTSTART:20261027T140000
DTEND:20261027T150000
DESCRIPTION:The Hubbard model is one of the iconic models of strongly corre
 lated electron systems. Although it greatly simplifies the physics of real
 -world materials\, it is believed to capture the essence of strong correla
 tion phenomena\, such as d-wave superconductivity and the pseudogap. Even 
 the most advanced numerical methods cannot yet fully resolve its phase dia
 gram\, which reflects a delicate competition between distinct ordered phas
 es. This balance can be tipped by small additional terms beyond the standa
 rd Hubbard description.\n\nIn this talk\, I will report on our recent prog
 ress in realizing tunable optical lattice systems for extended Hubbard mod
 els that include such terms. Using ultracold lithium\, we realize a quantu
 m gas microscope that offers fully spin- and charge-resolved readout\, tun
 able lattice geometries\, and entropy redistribution. We observe that this
  system develops long-range antiferromagnetic correlations at half filling
  and low temperature\, which disappear upon doping as signs of spin-stripe
  order emerge. By adding a tunable diagonal tunnel coupling to the square 
 lattice\, we break particle-hole symmetry and observe doping-dependent mag
 netism\, polaron correlations\, and dopant-pair correlations. At the entro
 py densities we explore\, these signatures are precursors of stripe format
 ion and superconductivity.\n
LOCATION:ETH Zürich\, Hönggerberg HPF G 6
ORGANIZER:Philipp Preiss
SUMMARY:Doping and Frustration in a Tunable Fermi-Hubbard System
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