UNIGE document Scientific Article
previous document  unige:39169  next document
add to browser collection
Title

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

Authors
Cilento, F.
Dal Conte, S.
Coslovich, G.
Peli, S.
Nembrini, N.
Mor, S.
Ferrini, G.
show hidden authors show all authors [1 - 21]
Published in Nature Communications. 2014, vol. 5
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 singleband Hubbard model, in which the short-range Coulomb repulsion leads to a k-space differentiation between nodal quasiparticles and antinodal excitations.
Identifiers
Full text
Structures
Project FNS: 200020-140761
Citation
(ISO format)
CILENTO, F. et al. Photo-enhanced antinodal conductivity in the pseudogap state of high-Tc cuprates. In: Nature Communications, 2014, vol. 5. https://archive-ouverte.unige.ch/unige:39169

264 hits

66 downloads

Update

Deposited on : 2014-08-05

Export document
Format :
Citation style :