Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly Doped Sr2IrO4

Article Article scientifique Article Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly Doped Sr2IrO4 eng 2015 author De La Torre Alberto 793516 author Mckeown Walker Siobhan 793495 author Bruno Flavio Yair 819904 author Ricco Sara 827343 author Wang Z. author Gutierrez Lezama Ignacio 681297 author Scheerer Gernot 815037 author Giriat Gaétan 810140 author Jaccard Didier 26363 author Berthod Christophe 0000-0002-0787-008X 133299 author Kim T. K. author Hoesch M. author Hunter E. C. author Perry R. S. author Tamai Anna 0000-0001-5239-6826 795188 author Baumberger Felix 0000-0001-7104-7541 790217 Félix Baumberger 176402 10.1103/PhysRevLett.115.176402 0031-9007 We report angle resolved photoemission experiments on the electron doped Heisenberg antiferromagnet Sr1−xLax2IrO4. For a doping level of x 1⁄4 0.05, we find an unusual metallic state with coherent nodal excitations and an antinodal pseudogap bearing strong similarities with underdoped cuprates. This state emerges from a rapid collapse of the Mott gap with doping resulting in a large underlying Fermi surface that is backfolded by a (π,π) reciprocal lattice vector which we attribute to the intrinsic structural distortion of Sr2IrO4. Dewey 500.2 Swiss National Science Foundation ARPES studies of surface 2DEGs on transition metal oxides and topological insulators 146995 CH Project funding 33 Département de physique de la matière quantique 131 false 805 Groupe Baumberger Physical review letters 115 fa92b236-0b68-48dc-9768-f46fd8513e6b Article (Published version) Public PRL 115, 176402 de la Torre.pdf 1233879 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly Doped Sr₂IrO₄	Physical review letters			2015	785	1,248

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Giriat, Gaétan