title: Interband quasiparticle scattering in superconducting LiFeAs reconciles photoemission and tunneling measurements.
abstract: Several angle-resolved photoemission spectroscopy (ARPES) studies reveal a poorly nested Fermi surface of LiFeAs, far away from a spin density wave instability, and clear-cut superconducting gap anisotropies. On the other hand a very different, more nested Fermi surface and dissimilar gap anisotropies have been obtained from quasiparticle interference (QPI) data, which were interpreted as arising from intraband scattering within holelike bands. Here we show that this ARPES-QPI paradox is completely resolved by interband scattering between the holelike bands. The resolution follows from an excellent agreement between experimental quasiparticle scattering data and T-matrix QPI calculations (based on experimental band structure data), which allows disentangling interband and intraband scattering processes.
authors: IFW Dresden, 01171 Dresden, Germany. c.hess@ifw-dresden.de
authors: Christian
authors: C
authors: Hess
authors: Steffen
authors: S
authors: Sykora
authors: Torben
authors: T
authors: Hänke
authors: Ronny
authors: R
authors: Schlegel
authors: Danny
authors: D
authors: Baumann
authors: Volodymyr B
authors: VB
authors: Zabolotnyy
authors: Luminita
authors: L
authors: Harnagea
authors: Sabine
authors: S
authors: Wurmehl
authors: Jeroen
authors: J
authors: van den Brink
authors: Bernd
authors: B
authors: Büchner