Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 9: Quantum Liquids, Miscellaneous 1
TT 9.5: Vortrag
Montag, 11. März 2013, 10:30–10:45, H21
Dynamical spin correlations in a quantum spin liquid. — •Johannes Knolle1, Dima Kovrizhin1, John Chalker2, and Roderich Moessner1 — 1Max Planck Institut for the Physics of Complex Systems, Dresden, Germany — 2Theoretical Physics, Oxford University, United Kingdom
We compute the exact time dependence of the spin-spin correlation function for arbitrary times in the gapped and gapless phases of Kitaev’s honeycomb model. The resulting dynamical structure factor - observable in a standard inelastic neutron scattering experiment - exhibits signatures of fractional excitations in the spin liquid ground state, namely the gap to creating a pair of emergent static Z2 fluxes, as well as various features of the density of states of the free fermions propagating in its background. Our analysis uncovers rich connections to the field of coherent nonequilibrium quantum dynamics, ranging all the way back to the physics of Andersons orthogonality catastrophe to the physics of Majorana fermions subject to a sequence of local potential quenches.