Topological relation between bulk gap nodes and surface bound states: Application to iron-based superconductors
Name
Wang-2012-Topological relation between bulk gap nodes and surface bound states.pdf
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430.77 KB
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Checksum (MD5)
4a0fd3bb8342ec26646ff40453016c72
Author(s)
Wang, Fa
Lee, Dung-Hai
Date Issued
September 2012
Journal
Physical Review B
Publisher
American Physical Society
Citation
Wang, Fa, and Dung-Hai Lee. “Topological Relation Between Bulk Gap Nodes and Surface Bound States: Application to Iron-based Superconductors.” Physical Review B 86.9 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
In the past few years materials with protected gapless surface (edge) states have risen to the central stage of condensed matter physics. Almost all discussions centered around topological insulators and superconductors, which possess full quasiparticle gaps in the bulk. In this paper we argue that systems with topological stable bulk nodes offer another class of materials with robust gapless surface states. Moreover the location of the bulk nodes determines the Miller index of the surfaces that show (or do not show) such states. Measuring the spectroscopic signature of these zero modes allows a phase-sensitive determination of the nodal structures of unconventional superconductors when other phase-sensitive techniques are not applicable. We apply this idea to gapless iron-based superconductors and show how to distinguish accidental from symmetry-dictated nodes. We shall argue that the same idea leads to a method for detecting a class of the elusive spin liquids.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.86.094512
