Data di Pubblicazione:
2014
Citazione:
Photo-enhanced antinodal conductivity in the pseudogap state of high-T c 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, F. Parmigiani. - In: NATURE COMMUNICATIONS. - ISSN 2041-1723. - 5(2014 Jul), pp. 4353.1-4353.10. [10.1038/ncomms5353]
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
high-temperature superconductor; angle-resolved photoemission; phase-transitions; mott insulator; fluctuations; spectroscopy; diagram; energy; order; gap
Elenco autori:
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, F. Parmigiani
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