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BEGIN:VEVENT
DTSTAMP:20260625T184303Z
DTSTART;VALUE=DATE-TIME:20161201T130000
DTEND;VALUE=DATE-TIME:20161201T140000
SUMMARY:Theory Seminar: Stephen Clark (Bath) -- "Enhanced super-exchange 
 pairing in a periodically driven Hubbard model"
TZID:Europe/London
UID:20161201-094d4345576c31f201578edcf5d923c8@warwick.ac.uk
CREATED:20161004T084348Z
DESCRIPTION:Controlling the structural and electronic properties of solid
 s with THz lasers has opened up tantalizing prospect in ultrafast materi
 als science. In contrast to optical frequencies it enables mode-selectiv
 e driving of vibrational excitations relevant for the establishment of v
 arious broken-symmetry states. In particular so-called light-induced sup
 erconductivity has been observed in several materials ranging from cupra
 tes to alkali-doped fullerenes. Motivated by experiments on driven infra
 red active molecular vibrations in organic materials\, I will discuss th
 e effect of a finite frequency ω modulation of on-site energies in the H
 ubbard model with a checkerboard spatial periodicity. In particular we f
 ocus on the strong-coupling limit U >> t of the doped Hubbard model wher
 e the effective t-J Hamiltonian is applicable and super-exchange pairing
  can occur. Through a Floquet analysis\, in the physically relevant regi
 me where U >> ω and ω >> t\, J\, we show that this driving causes a subs
 tantial suppression of the electronic hopping t\, while leaving the bare
  super-exchange interaction J unchanged. This suggests that electrons ca
 n be slowed down enough in the out-of-equilibrium state to allow the nor
 mally subordinate super-exchange interaction to become dominant\, and th
 us favour nearest-neighbour pairing. I will show that this leads to a co
 mpelling new pathway to engineering light-induced superconductivity in s
 trongly correlated quantum materials.
LOCATION:PS1.28
URL:http://www.bath.ac.uk/physics/contacts/academics/stephen-clark/index.
 html
ATTACH:http://www.bath.ac.uk/physics/contacts/academics/stephen-clark/ind
 ex.html
CATEGORIES:Theory Seminar
LAST-MODIFIED:20161128T115208Z
ORGANIZER;CN=Gareth Alexander:
END:VEVENT
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