Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Low-Dimensional Systems: Poster Session
TT 59.13: Poster
Mittwoch, 9. März 2016, 15:00–18:30, Poster D
Raman spectroscopic signature of fractionalized excitations in β-Li2IrO3 — •A. Glamazda1, S.-H. Do1, K.-Y. Choi1, and P. Lemmens2 — 1Department of Physics, Chung-Ang University, Seoul, Republic of Korea — 2IPKM, TU-BS, Braunschweig
The Kitaev honeycomb spin model is known to host exotic fractionalized quasiparticles. Using polarization resolved Raman spectroscopy we study the hyper-honeycomb compound β-Li2IrO3, a promising candidate of a three-dimensional Heisenberg-Kitaev system. A dynamical Raman response exhibits a broad scattering continuum with distinct polarization, which evolves into a quasielastic response with increasing temperature. The given experimental results give a signature of two-particle Majorana spinon excitations and demonstrate that β-Li2IrO3 is close in realizing a three-dimensional Kitaev spin liquid.
Work supported by RTG-DFG 1952/1, Metrology for Complex Nanosystems and the Laboratory for Emerging Nanometrology, TU Braunschweig.