next Q-MAC meetings in 2018:

3rd Q-MAC symposium in Venice, May 22-25, 2018.

Next regular meeting in Paris,       November 27-28, 2018.

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Antoine Georges leads the CCQ in New York

at the newly founded Flatiron Institute of the Simons Foundation.

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Publication Detail / Abstract

A. de la Torre, E. C. Hunter, A. Subedi, S. McKeown Walker, A. Tamai, T. K. Kim, M. Hoesch, R. S. Perry, A. Georges, F. Baumberger

Coherent Quasiparticles with a Small Fermi Surface in Lightly Doped Sr3Ir2O7

published in PRL on December 16, 2014
> Full text via publisher
We characterize the electron doping evolution of (Sr1-xLax)3Ir2O7 by means of angle-resolved photoemission. Concomitant with the metal insulator transition around x ≈ 0.05 we find the emergence of coherent quasiparticle states forming a closed small Fermi surface of volume 3x/2, where x is the independently measured La concentration. The quasiparticle weight Z remains large along the entire Fermi surface, consistent with the moderate renormalization of the low-energy dispersion, and no pseudogap is observed. This indicates a conventional, weakly correlated Fermi liquid state with a momentum independent residue Z ≈ 0.5 in lightly doped Sr3Ir2O7.
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