Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 12: Correlated Electrons: Frustrated Magnets - General 1
TT 12.4: Vortrag
Montag, 20. März 2017, 15:45–16:00, HSZ 03
Electronic Excitations and Lattice Vibrations on the Kagome Lattice: Herbertsmithite and Related Compounds — •Andrej Pustogow1, Mathias Bories1, Ievgen Voloshenko1, Pascal Puphal2, Cornelius Krellner2, Ying Li2, Roser Valenti2, and Martin Dressel1 — 11. Physikalisches Institut, Universität Stuttgart — 2Physikalisches Institut, Universität Frankfurt
We present a broadband optical and theoretical study of the electrodynamic response of the quantum spin liquid candidate Herbertsmithite and related Kagome lattice compounds. At low frequencies the spectrum of these frustrated Mott insulators is dominated by phonons. We assign the lattice vibrations within and perpendicular to the Kagome layer on the basis of theoretical calculations. In the visible and ultraviolet ranges we identify interband transitions and relate them to recent band structure calculations. Finally, we tackle the open question about the theoretically predicted contribution of spinon excitations to the low-frequency optical conductivity.