2011/10/04 by Tanmoy Das, R. S. Markiewicz, A. Bansil +1 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Angle-resolved photoemission spectroscopy #Condensed matter physics #Dispersion (optics) #Electronic structure #Fermi level #Fermi surface #Inelastic neutron scattering #Iron-based superconductors research #Neutron scattering #Optics #Photoemission spectroscopy #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quasiparticle #Scanning tunneling microscope #Scattering #Spectral line #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.85.064510
published as Phys. Rev. B 85, 064510 (2012) · 8 pages, 4 figures
arxiv created 2011/10/04 · openalex publication_date 2012/02/09 · arxiv updated 2012/02/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We develop an analytical tool to extract bulk electronic properties of unconventional superconductors from inelastic neutron scattering spectra. We show that the upward and downward branches of the spin excitation spectra have distinct origins, with the upper branch representing a gapped spin-wave dispersion and the lower branch associated with Bogoliubov quasiparticle scattering on the Fermi surface. Combined, they produce an ``hourglass'' dispersion with 45^\ensuremath∘ rotation of the spectrum, as found experimentally. The downward dispersion can be inverted to reveal the Fermi momentum dispersion of the single-particle spectrum as well as the corresponding superconducting (SC) gap function, analogously to the quasiparticle interference effect in scanning tunneling microscopy (STM). Whereas angle-resolved photoemission spectroscopy and STM provide surface-sensitive information, this inversion procedure provides bulk electronic properties. The technique is essentially model independent and can be applied to a wide variety of materials.