Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Poster Session: Correlated Electrons 2

TT 50.2: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Interaction effects on surface flat bands in 3D Kitaev spin liquids — •Christoph Berke and Simon Trebst — Institut für theoretische Physik, Universität zu Köln

Frustrated quantum magnets can give rise to unconventional spin-liquid ground states. Paradigmatic examples are two- and three-dimensional Kitaev systems that exhibit gapless spin liquids which are best described as Majorana metals that, depending on the underlying lattice structure, exhibit Fermi surfaces, nodal lines or Weyl nodes. Here we will discuss the physics of nodal-line Kitaev spin liquids, which are protected by the particle-hole symmetry inherent to Majorana fermions. Our interest is particularly on the flat-band surface states that accompany these bulk nodal lines. We investigate instabilities of these highly degenerated bands arising from additional spin exchange terms which introduce interactions between the Majorana fermions.