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11 octobre 2018: 1 événement


  • Pseudogap and electronic structure of elecron-droped Sr2IrO4

    Jeudi 11 octobre 2018 11:00-12:30 - Alice Moutenet - CPHT, Ecole Polytechnique

    Pseudogap and electronic structure of elecron-droped Sr2IrO4

    Résumé : In this talk, I will investigate the effects of correlations on the electronic structure of the Mott insulator Sr2IrO4 upon electron doping, from a theoretical point of view [1]. A rapid collapse of the Mott gap upon doping is found, and the electronic structure displays a strong momentum-space differentiation at low doping level : The Fermi surface consists of pockets centered around (π/2,π/2), while a pseudogap opens near (π,0). The pseudogap closes upon increasing doping, but a differentiated regime characterized by a modulation of the spectral intensity along the Fermi surface persists to higher doping levels. These results, obtained within the cellular dynamical mean-field-theory framework, are discussed in comparison to recent photoemission experiments [2,3,4] and an overall good agreement is found.
    [1] A. Moutenet, A. Georges, and M. Ferrero, PRB 97 155109 (2018).
    [2] Y.K. Kim, O. Krupin, J.D. Denlinger, A. Bostwick, E. Rotenberg, Q. Zhao, J. F. Mitchell, J. W. Allen, and B. J. Kim, Science 345, 187 (2014).
    [3] V. Brouet, J. Mansart, L. Perfetti, C. Piovera, I. Vobornik, P. Le Fèvre, F. Bertran, S. C. Riggs, M. C. Shapiro, P. Giraldo-Gallo, and I. R. Fisher, PRB 92, 081117(R) (2015).
    [4] A. de la Torre, S. McKeown Walker, F. Y. Bruno, S. Riccó, Z. Wang, I. Gutierrez Lezama, G. Scheerer, G. Giriat, D. Jaccard, C. Berthod, T. K. Kim, M. Hoesch, E. C. Hunter, R. S. Perry, A. Tamai, and F. Baumberger, PRL 115, 176402 (2015).

    Lieu : salle 208a, aîle sud LPS, bât 510

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