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SUMMARY:Bypassing the lattice BCS–BEC crossover in strongly correlated s
 uperconductors through multiorbital physics - Niklas Witt Wuerzburg Univer
 sity
DTSTART:20260126T140000Z
DTEND:20260126T143000Z
UID:TALK243286@talks.cam.ac.uk
CONTACT:130300
DESCRIPTION:Superconductivity emerges from the collective coherence of Coo
 per pairs. In lattice systems\, increasing the pairing strength tends to s
 trongly localize electrons and weaken phase stiffness\, thereby limiting c
 ritical temperatures – a phenomenon known as the (lattice) BCS–BEC cro
 ssover. We demonstrate that strongly correlated multiorbital systems can a
 chieve high critical temperatures beyond the usual (single-band) lattice B
 CS–BEC crossover. Using a model of alkali-doped fullerides (A3C60)\, we 
 find that the interplay of strong correlations and multiorbital effects en
 ables a localized superconducting state with short coherence length but ro
 bust stiffness\, where the critical temperature rises in a "domeless" fash
 ion with increasing pairing interaction. To derive these insights\, we int
 roduce a new theoretical framework [1] that allows calculations of the fun
 damental superconducting length scales\, namely the coherence length (ξ )
  and the London penetration depth (λ_L)\, even in the presence of strong 
 electron correlations.\n\n\n\n[1] N. Witt et al.\, npj Quantum Mater. 9\, 
 100 (2024)
LOCATION:https://zoom.us/j/92447982065?pwd=RkhaYkM5VTZPZ3pYSHptUXlRSkppQT0
 9
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