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TT: Fachverband Tiefe Temperaturen

TT 35: Frustrated Magnets - Strong Spin-Orbit Coupling 1 (joint session TT/MA)

TT 35.6: Vortrag

Mittwoch, 18. März 2020, 11:00–11:15, HSZ 304

Giant coupling between phonons and Majorana fermions in a Kitaev spin liquid — •Dirk Wulferding^1,2, Youngsu Choi³, Yann Gallais⁴, Clément Faugeras⁵, Peter Lemmens^1,2, Seung-Hwan Do⁶, and Kwang-Yong Choi³ — ¹IPKM, TU-BS, Braunschweig, Germany — ²LENA, TU-BS, Braunschweig, Germany — ³Chung-Ang Univ., Seoul, Korea — ⁴Univ. Paris-Diderot, Paris, France — ⁵LNCMI Grenoble, France — ⁶Oak Ridge National Lab, USA

In the Kitaev honeycomb candidate material α-RuCl₃ a continuum of fractionalized Majorana fermions exists which can be directly probed by Raman spectroscopy [1-5]. In-plane magnetic fields gap the continuum, thereby confining it energetically to the regime of optical phonons. Using high-field Raman spectroscopy [6], we shine a light onto the interplay of Majorana fermions and phonons, which results in a drastic reduction of the phonon lifetimes together with a renormalization of phonon energies.
Work supported by QUANOMET NL-4 and DFG LE967/16-1.

[1] Sandilands, et al., Phys. Rev. Lett. 114, 147201 (2014)

[2] Knolle, et al., Phys. Rev. Lett. 113, 187201 (2014)

[3] Glamazda, et al., Phys. Rev. B 95, 174429 (2017)

[4] Glamazda, et al., Nat. Commun. 7, 12286 (2016)

[5] Sahasrabudhe, et al., arXiv:1908.11617 (2019)

[6] Wulferding, et al., arXiv:1910.00800 (2019)