Photo-enhanced antinodal conductivity in the pseudogap state of high-Tc cuprates

F. Cilento (), S. Dal Conte, G. Coslovich, S. Peli, N. Nembrini, S. Mor, F. Banfi, G. Ferrini, H. Eisaki, M. K. Chan, C. J. Dorow, M. J. Veit, M. Greven, D. van der Marel, R. Comin, A. Damascelli, L. Rettig, U. Bovensiepen, M. Capone, C. Giannetti () and F. Parmigiani
Additional contact information
F. Cilento: Elettra—Sincrotrone Trieste S.C.p.A.
S. Dal Conte: Università Cattolica del Sacro Cuore
G. Coslovich: Università degli Studi di Trieste
S. Peli: Università Cattolica del Sacro Cuore
N. Nembrini: Università Cattolica del Sacro Cuore
S. Mor: Università Cattolica del Sacro Cuore
F. Banfi: Università Cattolica del Sacro Cuore
G. Ferrini: Università Cattolica del Sacro Cuore
H. Eisaki: Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba
M. K. Chan: School of Physics and Astronomy, University of Minnesota
C. J. Dorow: School of Physics and Astronomy, University of Minnesota
M. J. Veit: School of Physics and Astronomy, University of Minnesota
M. Greven: School of Physics and Astronomy, University of Minnesota
D. van der Marel: Université de Genève
R. Comin: University of British Columbia
A. Damascelli: University of British Columbia
L. Rettig: Fakultaet fuer Physik and Zentrum für Nanointegration (CENIDE), Universitaet Duisburg-Essen
U. Bovensiepen: Fakultaet fuer Physik and Zentrum für Nanointegration (CENIDE), Universitaet Duisburg-Essen
M. Capone: CNR-IOM Democritos National Simulation Center and Scuola Internazionale Superiore di Studi Avanzati (SISSA), Via Bonomea 265
C. Giannetti: Università Cattolica del Sacro Cuore
F. Parmigiani: Elettra—Sincrotrone Trieste S.C.p.A.

Nature Communications, 2014, vol. 5, issue 1, 1-10

Abstract: Abstract A major challenge in understanding the cuprate superconductors is to clarify the nature of the fundamental electronic correlations that lead to the pseudogap phenomenon. Here we use ultrashort light pulses to prepare a non-thermal distribution of excitations and capture novel properties that are hidden at equilibrium. Using a broadband (0.5–2 eV) probe, we are able to track the dynamics of the dielectric function and unveil an anomalous decrease in the scattering rate of the charge carriers in a pseudogap-like region of the temperature (T) and hole-doping (p) phase diagram. In this region, delimited by a well-defined T*neq(p) line, the photoexcitation process triggers the evolution of antinodal excitations from gapped (localized) to delocalized quasiparticles characterized by a longer lifetime. The novel concept of photo-enhanced antinodal conductivity is naturally explained within the single-band Hubbard model, in which the short-range Coulomb repulsion leads to a k-space differentiation between nodal quasiparticles and antinodal excitations.

Date: 2014
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DOI: 10.1038/ncomms5353

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