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

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.

arXiv comment16 pages, 10 figures; Comments: fixed bbl

References in corpus (38)

• Quantum Spin Liquids
• Majorana quantization and half-integer thermal quantum Hall effect in a Kitaev spin liquid
• Proximate Kitaev Quantum Spin Liquid Behaviour in α-RuCl${}_3$
• Neutron tomography of magnetic Majorana fermions in a proximate quantum spin liquid
• Interlayer breathing and shear modes in few-trilayer MoS2 and WSe2
• A Field Guide to Spin Liquids
• Scattering Continuum and Possible Fractionalized Excitations in $\alpha$-RuCl${}_3$
• Evidence for a spinon Fermi surface in a triangular lattice quantum spin liquid candidate
• Evidence for a Field-induced Quantum Spin Liquid in $\alpha$-RuCl${}_3$
• Field-tunable quantum disordered ground state in the triangular lattice antiferromagnet NaYbO${}_2$
• Rare-earth chalcogenides: A large family of triangular lattice spin liquid candidate
• NaYbS${}_2$ - a new planar spin-$\frac{1}{2}$ triangular-lattice magnet and putative spin liquid
• Gapless spin-liquid state in the structurally disorder-free triangular antiferromagnet NaYbO${}_2$
• Anisotropic field-induced ordering in the triangular-lattice quantum spin liquid NaYbSe${}_2$
• Observation of two types of anyons in the Kitaev honeycomb magnet
• Field-induced instability of the quantum-spin-liquid ground state in the $J_{\mathrm{eff}}=\frac{1}{2}$ triangular-lattice compound NaYbO${}_2$
• Magnon bound states vs. anyonic Majorana excitations in the Kitaev honeycomb magnet $\alpha$-RuCl${}_3$
• PyCrystalField: Software for Calculation, Analysis, and Fitting of Crystal Electric Field Hamiltonians
• Quantum spin liquid ground state in the disorder free triangular lattice NaYbS${}_2$
• Field-induced magnetic transition and spin fluctuation in quantum spin liquid candidate CsYbSe${}_2$
• Gapped magnetic ground state in quantum-spin-liquid candidate $\kappa$-(BEDT-TTF)${}_2$-Cu${}_2$(CN)${}_3$
• A Class of Compounds Featuring Frustrated Triangular Magnetic Lattice CsRESe${}_2$ (RE=La-Lu): Quantum Spin-Liquid Candidates
• High-Field Quantum Disordered State in $\alpha$-RuCl3: Spin Flips, Bound States, and a Multi-Particle Continuum
• Emergence of Frohlich polaron from interlayer electron-phonon coupling in van der Waals heterostructure
• Observation of the polaronic character of excitons in a two-dimensional semiconducting magnet $\mathrm{Cr}{\mathrm{I}}_3$
• Crystalline Electric-Field Excitations in Quantum Spin Liquids Candidate $NaYbS{e}_2$
• The range of non-Kitaev terms and fractional particles in RuCl${}_3$
• Phonon dynamics in the Kitaev spin liquid
• Yb delafossites: unique exchange frustration of 4f spin 1/2 moments on a perfect triangular lattice
• Magnetoelastic hybrid excitations in CeAuAl${}_3$
• Dual model for magnetic excitations and superconductivity in UPd2Al3
• Synthesis and Anisotropic Magnetism in Quantum Spin Liquid Candidates $A$YbSe${}_2$ ($A$ = K and Rb)
• Magneto-elastic induced vibronic bound state in the spin ice pyrochlore Ho${}_2$Ti${}_2$O${}_7$
• Systematic extraction of crystal electric-field effects and quantum magnetic model parameters in triangular rare-earth magnets
• Emergent Vibronic Excitations in the Magnetodielectric Regime of ${\text{Ce}}_2{\text{O}}_3$: Raman Scattering Studies
• Temperature evolution of the phonon dynamics in the Kitaev spin liquid
• Lattice dynamics and coupled quadrupole-phonon excitations in CeAuAl${}_3$
• Magnetostriction of α-RuCl3 flakes in the zigzag phase

Cited by in corpus (5)

• Evidence of Dirac Quantum Spin Liquid in YbZn2GaO5
• Rare-Earth Chalcogenides: An Inspiring Playground For Exploring Frustrated Magnetism
• Crystal-field effects competing with spin-orbit interactions in NaCeO${}_2$
• Yb${}^{3+}$ $f$-$f$ excitations in NaYbSe${}_2$: benchmarking embedded-cluster quantum chemical schemes for 4$f$ insulators
• More bridging ligands activate direct exchange: the case of anisotropic Kitaev effective magnetic interactions