Two-phonon absorption spectra in the layered honeycomb compound α-RuCl3

Yoshinao Hasegawa, Takuya Aoyama, Koya Sasaki, Yuka Ikemoto, Taro Moriwaki, Toshiya Shirakura, Riichiro Saito, Yoshinori Imai, Kenya Ohgushi

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9 Citations (Scopus)

Abstract

We performed infrared absorption spectroscopy for α-RuCl3 with a two-dimensional honeycomb lattice of Ru3+ ions. In the mid-infrared range, we observed three absorption peaks corresponding to intra-atomic d–d transitions among Ru3+ ions in accordance with a previous report. In the far-infrared range, we observed conspicuous broad absorption structures near 600 cm−1 in addition to several sharp single phonon peaks. Our first-principles calculations for the isolate sandwich model together with the factor group analysis revealed that the peak structures near 600 cm−1 are absorptions related to a two-phonon process. Our results stimulate further study on the spin–lattice coupling in α-RuCl3 as well as the optical detection of Majorana excitations in Kitaev spin liquids.

Original languageEnglish
Article number123709
Journaljournal of the physical society of japan
Volume86
Issue number12
DOIs
Publication statusPublished - 2017 Dec 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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