Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Correlated Electrons: Frustrated Magnets - Pyrochlore Systems and Iridates
TT 3.13: Vortrag
Montag, 7. März 2016, 12:45–13:00, H20
Neutron scattering signatures of the 3D hyper-honeycomb Kitaev quantum spin-liquid — •Adam Smith1, Johannes Knolle1, Dmitry L. Kovrizhin1,2, John T. Chalker3, and Roderich Moessner4 — 1T.C.M. Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom — 2RRC Kurchatov Institute, 1 Kurchatov Square, Moscow 123182, Russia — 3Theoretical Physics, Oxford University, 1 Keble Road, Oxford OX1 3NP, United Kingdom — 4Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany
Motivated by recent synthesis of the hyper-honeycomb material β-Li2IrO3, we study the dynamical structure factor (DSF) of the corresponding 3D Kitaev quantum spin-liquid (QSL), whose fractionalised degrees of freedom are Majorana fermions and emergent flux-loops. Properties of this 3D model are known to differ in important ways from those of its 2D counterpart - it has finite-temperature phase transition, as well as distinct features in Raman response. We show, however, that the qualitative behaviour of the DSF is broadly dimension-independent. Characteristics of the 3D DSF include a response gap even in the gapless QSL phase and an energy dependence deriving from the Majorana fermion density of states. Since the majority of the response is from states containing a single Majorana excitation, our results suggest inelastic neutron scattering as the spectroscopy of choice to illuminate the physics of Majorana fermions in Kitaev QSLs.