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SUMMARY:Quantum gas microscopy of the doped Fermi-Hubbard model - Max-Plan
 ck-Institut fur Quantenoptik (MPQ)\, Garching\, Germany
DTSTART:20181127T140000Z
DTEND:20181127T150000Z
UID:TALK115399@talks.cam.ac.uk
CONTACT:Kayleigh Dunn
DESCRIPTION:Strongly correlated electronic systems\, usually described by 
 the Fermi-Hubbard model\, can host a large variety of exotic phenomena suc
 h as high-Tc superconductivity and non Fermi liquid behaviour. Our underst
 anding of the doped Fermi-Hubbard model\, however\, vastly depends on the 
 dimensionality. Whereas powerful analytical and numerical techniques exist
  in one dimension\, its phase diagram is still debated in two dimensions. 
 I report here on our recent experimental studies of this model in both one
  and two dimensions using spin and density resolved quantum gas microscopy
 . In 1d\, I will describe our direct observation of two fundamental predic
 tions for Luttinger liquids. I will show that incommensurate spin correlat
 ions emerge in both doped and spin imbalanced systems and I will provide a
  microscopic picture for these phenomena. In the particle-doped two-dimens
 ional Fermi-Hubbard model\, I will demonstrate that the competition betwee
 n kinetic and magnetic energy leads instead to the formation of a magnetic
  polaron. The study of the spin environment around a mobile doublon direct
 ly reveals its local dressing by a cloud with reduced antiferromagnetic co
 rrelations. In contrast\, when pinning a doublon to one lattice site\, we 
 observe an opposite effect with increased antiferromagnetic correlations i
 n its vicinity. These works open fascinating perspectives to study strongl
 y correlated quantum many-body systems with single particle and single spi
 n resolution.
LOCATION:Ryle Seminar Room (930) 
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