Orbital-selective Mott phase in multiorbital models for iron pnictides and chalcogenides
نویسندگان
چکیده
Rong Yu1,2 and Qimiao Si3 1Department of Physics, Renmin University of China, Beijing 100872, China 2Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China and Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China 3Department of Physics & Astronomy, Rice University, Houston, Texas 77005, USA (Received 13 May 2017; published 7 September 2017)
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Orbital-selective Mott phase in multiorbital models for alkaline iron selenides K1-xFe2-ySe2.
We study a multiorbital model for the alkaline iron selenides K(1-x)Fe(2-y)Se(2) using a slave-spin method. With or without ordered vacancies, we identify a metal-to-Mott-insulator transition at the commensurate filling of six 3d electrons per iron ion. For Hund's couplings beyond a threshold value, this occurs via an intermediate orbital-selective Mott phase, in which the 3d xy orbital is Mott...
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