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    Université de Fribourg

    Large temperature dependence of the number of carriers in co-doped BaFe₂As₂

    Brouet, V. ; Lin, Ping-Hui ; Texier, Y. ; Bobroff, J. ; Taleb-Ibrahimi, A. ; Fèvre, P. Le ; Bertran, F. ; Casula, M. ; Werner, Philipp ; Biermann, S. ; Rullier-Albenque, F. ; Forget, A. ; Colson, D.

    In: Physical Review Letters, 2013, vol. 110, no. 16, p. 167002

    Using angle-resolved photoemission spectroscopy, we study the evolution of the number of carriers in Ba(Fe₁₋Cox)₂As₂ as a function of Co content and temperature. We show that there is a k-dependent energy shift compared to density functional calculations, which is large below 100 K at low Co contents and reduces the volume of hole and electron pockets by a factor 2. This k...

    Université de Fribourg

    Long-Range coulomb interactions in surface systems: a first-Principles description within self-Consistently combined GW and dynamical mean-Field theory

    Hansmann, P. ; Ayral, T. ; Vaugier, L. ; Werner, Philipp ; Biermann, S.

    In: Physical Review Letters, 2013, vol. 110, no. 16, p. 166401

    Systems of adatoms on semiconductor surfaces display competing ground states and exotic spectral properties typical of two-dimensional correlated electron materials which are dominated by a complex interplay of spin and charge degrees of freedom. We report a fully ab initio derivation of low-energy Hamiltonians for the adatom systems Si(111):X, with X=Sn, Si, C, Pb, that we solve within...

    2 results 1