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Paper detail

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

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.

preprint2021arXivOpen access
Yun-Yi PaiClaire E. MarvinneyLiangbo LiangJie XingAllen ScheieAlexander A. PuretzkyGábor B. HalászXun LiRinkle JunejaAthena S. SefatDavid ParkerLucas LindsayBenjamin J. Lawrie
cond-mat.str-elquant-ph
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Yun-Yi PaiClaire E. MarvinneyLiangbo LiangJie XingAllen ScheieAlexander A. PuretzkyGábor B. HalászXun LiRinkle JunejaAthena S. SefatDavid ParkerLucas LindsayBenjamin J. Lawrie

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