Raman scattering signatures of Kitaev spin liquids in A(2)IrO(3) iridates with A=Na or Li.
We show how Raman spectroscopy can serve as a valuable tool for diagnosing quantum spin liquids (QSL). We find that the Raman response of the gapless QSL of the Kitaev-Heisenberg model exhibits signatures of spin fractionalization into Majorana fermions, which give rise to a broad signal reflecting their density of states, and Z(2) gauge fluxes, which also contribute a sharp feature. We discuss the current experimental situation and explore more generally the effect of breaking the integrability on response functions of Kitaev spin liquids.
Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany.
J
J
Knolle
Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Gia-Wei
GW
Chern
T.C.M. Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom, and RRC Kurchatov Institute, 1 Kurchatov Square, Moscow 123182, Russia.
D L
DL
Kovrizhin
Max Planck Institute for the Physics of Complex Systems, D-01187 Dresden, Germany.
R
R
Moessner
Department of Physics, University of Wisconsin, Madison, Wisconsin 53706, USA and School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55116, USA.
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NB
Perkins