Événements

Séminaire IQ: Alice Moutenet

Date : 22 mai 2019 10:45

Type : Séminaires

Lieu : D3-2040

Alice Moutenet Flatiron Institute Pseudogap and electronic structure of elecron-droped Sr2IrO4 Abstract: 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]. I will start by introducing a tight-binding model for this material before introducing correlations within the cellular dynamical mean-field-theory framework. 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 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). For those interested in further discussions: I also work on the development of extensions of diagrammatic Monte Carlo methods. A first work in imaginary-time presented how to sample dynamic quantities such as the self-energy by resumming Feynman diagrams in the computation of the MC weight [1,2]. A recent work in real time reexpress the algorithm presented in [3] in the Larkin-Ovchinnikov basis, showing that we can directly cancel vacuum diagrams in the formalism without having to regroup Feynman diagrams [4]. [1] R.Rossi, PRL 119, 045701 (2017) [2] A. Moutenet, W. Wu, M.Ferrero, PRB 97, 085117 (2018) [3] R. E. V. Profumo, C. Groth, L. Messio, O. Parcollet, and X. Wain- tal, PRB 91, 245154 (2015). [4] A. Moutenet, M. Ferrero, O. Parcollet, arXiv:1904.11969

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