title: Revealing the high-energy electronic excitations underlying the onset of high-temperature superconductivity in cuprates.
abstract: In strongly correlated systems the electronic properties at the Fermi energy (E(F)) are intertwined with those at high-energy scales. One of the pivotal challenges in the field of high-temperature superconductivity (HTSC) is to understand whether and how the high-energy scale physics associated with Mott-like excitations (|E-E(F)|>1 eV) is involved in the condensate formation. Here, we report the interplay between the many-body high-energy CuO(2) excitations at 1.5 and 2 eV, and the onset of HTSC. This is revealed by a novel optical pump-supercontinuum-probe technique that provides access to the dynamics of the dielectric function in Bi(2)Sr(2)Ca(0.92)Y(0.08)Cu(2)O(8+δ) over an extended energy range, after the photoinduced suppression of the superconducting pairing. These results unveil an unconventional mechanism at the base of HTSC both below and above the optimal hole concentration required to attain the maximum critical temperature (T(c)).
authors.affiliation: Department of Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy. c.giannetti@dmf.unicatt.it
authors.forename: Claudio
authors.initials: C
authors.lastname: Giannetti
authors.forename: Federico
authors.initials: F
authors.lastname: Cilento
authors.forename: Stefano
authors.initials: S
authors.lastname: Dal Conte
authors.forename: Giacomo
authors.initials: G
authors.lastname: Coslovich
authors.forename: Gabriele
authors.initials: G
authors.lastname: Ferrini
authors.forename: Hajo
authors.initials: H
authors.lastname: Molegraaf
authors.forename: Markus
authors.initials: M
authors.lastname: Raichle
authors.forename: Ruixing
authors.initials: R
authors.lastname: Liang
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Eisaki
authors.forename: Martin
authors.initials: M
authors.lastname: Greven
authors.forename: Andrea
authors.initials: A
authors.lastname: Damascelli
authors.forename: Dirk
authors.initials: D
authors.lastname: van der Marel
authors.forename: Fulvio
authors.initials: F
authors.lastname: Parmigiani
mesh_terms: D055598:Chemical Phenomena; D003300:Copper / Q000737:chemistry*; D004553:Electric Conductivity; D004583:Electrons; D006358:Hot Temperature; D010825:Physics
chemical_list: D003300:Copper