Abstract
Motivated by the recent low-temperature experiments on bulk FeSe, we study the electron correlation effects in a multiorbital model for this compound in the nematic phase using the U(1) slave-spin theory. We find that a finite nematic order helps to stabilize an orbital selective Mott phase. Moreover, we propose that when the d- and s-wave bond nematic orders are combined with the ferro-orbital order, there exists a surprisingly large orbital selectivity between the xz and yz orbitals even though the associated band splitting is relatively small. Our results explain the seemingly unusual observation of strong orbital selectivity in the nematic phase of FeSe, uncover new clues on the nature of the nematic order, and set the stage to elucidate the interplay between superconductivity and nematicity in iron-based superconductors.
Highlights
Orbital selectivity enhanced by nematic order in FeSeRong Yu,1, ∗ Jian-Xin Zhu,2, † and Qimiao Si3, ‡ 1Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China 2Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 3Department of Physics & Astronomy, Rice University, Houston, Texas 77005,USA
The iron-based superconductors (FeSCs) present a topic of extensive current research in condensed matter physics [1,2,3,4,5,6]
With a single nematic order alone, to keep the band splittings ∆EΓ and ∆EM to be compatible to the observed values (< 50 meV), we find that the bare nematic order must be small, leading to a weak orbital selectivity in the xz and yz sector with Zyz/Zxz close to 1
Summary
Rong Yu,1, ∗ Jian-Xin Zhu,2, † and Qimiao Si3, ‡ 1Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China 2Theoretical Division and Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 3Department of Physics & Astronomy, Rice University, Houston, Texas 77005,USA. Motivated by the recent low-tempearture experiments on bulk FeSe, we study the electron correlation effects in a multiorbital model for this compound in the nematic phase using the U (1) slave-spin theory. We find that a finite nematic order helps to stabilize an orbital selective Mott phase. We propose that when the d- and s-wave bond nematic orders are combined with the ferro-orbital order, there exists a surprisingly large orbital selectivity between the xz and yz orbitals even though the associated band splitting is relatively small. Our results explain the seemingly unusual observation of strong orbital selectivity in the nematic phase of FeSe, uncover new clues on the nature of the nematic order, and set the stage to elucidate the interplay between superconductivity and nematicity in iron-based superconductors
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