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TT: Fachverband Tiefe Temperaturen

TT 12: Correlated Electrons: Frustrated Magnets - General 1

TT 12.4: Talk

Monday, March 20, 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.