Effect of nonsymmorphic space groups on correlation functions in iron-based superconductors

R. Nourafkan and A.-M. S. Tremblay
Phys. Rev. B 96, 125140 – Published 21 September 2017

Abstract

The orbital basis is natural when one needs to calculate the effect of local interactions or to unravel the role of orbital physics in the response to external probes. In systems with nonsymmorphic point groups, such as the iron-based superconductors, we show that symmetries that emerge in observable response functions at certain wave vectors are absent from generalized susceptibilities calculated with tight-binding Hamiltonians in the orbital basis. Such symmetries are recovered only when the generalized susceptibilities are embeded back to the continuum using appropriate matrix elements between basis states. This is illustrated with the case of LiFeAs and is further clarified using a minimal tight-binding Hamiltonian with nonsymmorphic space group.

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  • Received 20 February 2016
  • Revised 5 September 2017

DOI:https://doi.org/10.1103/PhysRevB.96.125140

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

R. Nourafkan1 and A.-M. S. Tremblay1,2

  • 1Département de Physique, Institut quantique and Regroupement québécois sur les matriaux de pointe, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
  • 2Quantum Materials Program, Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1Z8

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Issue

Vol. 96, Iss. 12 — 15 September 2017

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