Orbital-Selective Pairing and Nematic Order in the Iron-Based Superconductors

ORAL

Abstract

The considerations of the orbital-selective Mott phase in the normal state [1,2] motivated the theoretical proposal for orbital-selective pairing [3]. The experimental evidence for the latter has come from both the iron pnictides [4] and iron selenides [5]. Motivated by the recent experiments, we theoretically study the role of the nematic order in the orbital-selective pairing within multi-orbital models for superconductivity driven by short-range magnetic exchange interactions. We consider several ways that characterize the nematicity in the Hamiltonian, and present systematic results on how the pairing-state competition [6], the orbital dependency of the intra-orbital pairing amplitudes, the pairing symmetry and the gap anisotropy depend on the nematicity.

[1] R. Yu and Q. Si, PRL 110, 146402 (2013); PRB 84, 235115 (2011).
[2] M. Yi et al., PRL 110, 067003 (2013).
[3] R. Yu, J.-X. Zhu and Q. Si, PRB 89, 024509 (2014).
[4] C. Zhang et al., Phys. Rev. Lett. 111, 207002 (2013).
[5] P. O. Sprau et al., Science 357, 75 (2017).
[6] E. M. Nica, R. Yu and Q. Si, Npj Quantum Materials 2, 24 (2017).

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Presenters

  • Haoyu Hu

    Rice University

Authors

  • Haoyu Hu

    Rice University

  • Emilian Nica

    University of British Columbia, The University of British Columbia, Univ of British Columbia

  • Rong Yu

    Renmin University, Renmin University of China, Department of Physics, Renmin University of China

  • Qimiao Si

    Department of Physics and Astronomy, Rice University, Physics and Astronomy, Rice Univ, Physics and Astronomy, Rice University, Rice Univ, Rice Universiry, Physics, Rice University, Rice University, Department of Physics and Astronomy and Rice Center for Quantum Materials, Rice University, Physics and Astronomy, and Rice Center for Quantum Materials, Rice University, Department of Physics and Astronomy, Rice Univ