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SUMMARY:BEC-to-BCS crossover from doublon to hole doping in the t’-Hubba
 rd model
DTSTART:20260429T080000Z
DTEND:20260429T090000Z
DTSTAMP:20260511T110400Z
UID:indico-event-18781@indico.psi.ch
CONTACT:andreas.elben@psi.ch\;cornelius.hempel@psi.ch
DESCRIPTION:Speakers: Fabian Grusdt (LMU Munich)\n\nUnderstanding the micr
 oscopic origins of high-temperature superconductivity and its competition 
 with stripe formation remains a central challenge in strongly correlated p
 hysics. Quantum simulation platforms now enable direct access to these phe
 nomena in paradigmatic models such as the Fermi-Hubbard model. Building on
  this progress\, we focus on the extended t′-Hubbard model\, which captu
 res key features of correlated cuprates. Using large-scale density-matrix 
 renormalization group (DMRG) simulations and insights from quantum gas mic
 roscopy\, we investigate the nature of charge carriers and pairing correla
 tions across doublon- and hole-doped regimes. From two-particle spectral f
 unctions\, which can be accessed in cold-atom experiments\, we identify tw
 o distinct pairing channels and provide evidence for a continuous BEC-to-B
 CS crossover as the next-nearest-neighbor tunneling t′ is tuned from po
 sitive to negative values. On the BCS side\, we observe an emergent instab
 ility toward spin-charge stripe formation\, revealing the microscopic mech
 anism behind the competition between superconductivity and stripe order. O
 ur results suggest that the superconducting dome in doped Hubbard systems 
 may be closely tied to a nearby BCS-to-BEC crossover resulting from an eme
 rgent Feshbach resonance\, pointing to a unifying picture for pairing in s
 trongly correlated fermions and motivating future explorations with quantu
 m simulators and advanced numerical methods.\n\nhttps://indico.psi.ch/even
 t/18781/
LOCATION:ODRA/111
URL:https://indico.psi.ch/event/18781/
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