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

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arxiv 2111.03919 v3 pith:B26WP3LI submitted 2021-11-06 cond-mat.str-el quant-ph

Yun-Yi Pai , Claire E. Marvinney , Liangbo Liang , Jie Xing , Allen Scheie , Alexander A. Puretzky , Gábor B. Halász , Xun Li
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Rinkle Juneja Athena S. Sefat David Parker Lucas Lindsay Benjamin J. Lawrie
This is my paper · ORCID
classification cond-mat.str-elquant-ph
keywords modescef-phononcandidatecsybseidentifiedliquidmesoscalephonon
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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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