Related papers: Nearly-Resonant Crystalline-Phononic Coupling in Quantum Spin Liquid Candidate CsYbSe$

Nearly-Resonant Crystalline-Phononic Coupling in Quantum Spin Liquid Candidate CsYbSe$_2$

URL: http://arxiv.org/abs/2111.03919v3
Date: Sat, 20 Nov 2021 20:14:20 GMT
Title: Nearly-Resonant Crystalline-Phononic Coupling in Quantum Spin Liquid Candidate CsYbSe$_2$
Authors: Yun-Yi Pai, Claire E. Marvinney, Liangbo Liang, Jie Xing, Allen Scheie, Alexander A. Puretzky, G\'abor B. Hal\'asz, Xun Li, Rinkle Juneja, Athena S. Sefat, David Parker, Lucas Lindsay, Benjamin J. Lawrie
Abstract summary: CsYbSe$$, a recently identified quantum spin liquid (QSL) candidate, exhibits strong crystal electric field excitations. We identify phonon and CEF modes with Raman spectroscopy and observe strong CEF-phonon mixing resulting in a vibronic bound state.
Score: 48.30279211143264
License: http://creativecommons.org/licenses/by/4.0/
Abstract: CsYbSe$_2$, a recently identified quantum spin liquid (QSL) candidate, exhibits strong crystal electric field (CEF) excitations. Here, we identify phonon and CEF modes with Raman spectroscopy and observe strong CEF-phonon mixing resulting in a vibronic bound state. Complex, mesoscale interplay between phonon modes and CEF modes is observed in real space, and an unexpected nearly resonant condition is satisfied, yielding up to fifth-order combination modes, with a total of 17 modes identified in the spectra. This study paves the way to coherent control of possible QSL ground states with optically accessible CEF-phonon manifolds and mesoscale engineering of CEF-phonon interactions.

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