Spin-Wave Excitations Evidencing the Kitaev Interaction in Single Crystalline 
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Ran, Kejing; Wang, Jinghui; Wang, Wei; Dong, Zhao-Yang; Ren, Xiao; Bao, Song; Li, Shichao; Ma, Zhen; Gan, Yuan; Zhang, Youtian; Park, J. T.; Deng, Guochu; Danilkin, Sergey; Yu, Shuling; Li, Jianxin; Wen, Jinsheng

doi:10.1103/physrevlett.118.107203

Cited by 191 publications

(182 citation statements)

References 51 publications

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“…Importantly, a finite Γ term is required to reproduce the measured magnetic field evolution of the spin-wave excitations at the magnetic zone center by our TDTS measurements [ Fig. 3(c)], in addition to the reported gap of ∼2 meV seen near the M point in previous neutron scattering studies [25,26,28,35]. Qualitative agreement with our experimental results is retrieved, in that resonance I blueshifts with increasing field while resonance II redshifts.…”

Section: B Lswt In a Magnetic Fieldsupporting

confidence: 88%

“…1(b)] [23,24]. Nevertheless, spectroscopic probes, including inelastic neutron scattering (INS) [25][26][27][28], spontaneous Raman scattering [29,30], time-domain terahertz spectroscopy (TDTS) [31][32][33], and electron paramagnetic resonance (EPR) [34], have discovered signatures of a field-induced QSL state above 7.5 T in the form of a broad continuum at the 2D magnetic Brillouin zone center. Yet a complete understanding of the origin of these excitations as well as of the spin dynamics is still lacking.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic field-dependent low-energy magnon dynamics in α–RuCl3

et al. 2019

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Revealing the spin excitations of complex quantum magnets is key to developing a minimal model that explains the underlying magnetic correlations in the ground state. We investigate the lowenergy magnons in α-RuCl3 by combining time-domain terahertz spectroscopy under an external magnetic field and model Hamiltonian calculations. We observe two absorption peaks around 2.0 and 2.4 meV, which we attribute to zone-center spin waves. Using linear spin-wave theory with only nearest-neighbor terms of the exchange couplings, we calculate the antiferromagnetic resonance frequencies and reveal their dependence on an external field applied parallel to the nearest-neighbor Ru-Ru bonds. We find that the magnon behavior in an applied magnetic field can be understood only by including an off-diagonal Γ exchange term to the minimal Heisenberg-Kitaev model. Such an anisotropic exchange interaction that manifests itself as a result of strong spin-orbit coupling can naturally account for the observed mixing of the modes at higher fields strengths. arXiv:1909.00462v1 [cond-mat.str-el] 1 Sep 2019

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Section: B Lswt In a Magnetic Fieldsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Magnetic field-dependent low-energy magnon dynamics in α–RuCl3

et al. 2019

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“…The spin interactions are restricted by the low-dimensional structure, which could enhance the spin fluctuations [2]. Until now most QSL candidates are proposed in the low-spin S=1/2 frustrated systems, such as A 2 IrO 3 (A=Na, Li, Cu), H 3 LiIr 2 O 6 , κ-(BEDT-TTF) 2 Cu 2 (CN) 3 , EtMe 3 Sb[Pd(dmit) 2 ] 2 , and RuCl 3 [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Field-induced magnetic transition and spin fluctuations in the quantum spin-liquid candidate CsYbSe2

et al. 2019

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Two-dimensional triangular-lattice materials with spin-1/2 are perfect platforms for investigating quantum frustrated physics with spin fluctuations. Here we report the structure, magnetization, heat capacity and inelastic neutron scattering (INS) results on cesium ytterbium diselenide, CsYbSe2. There is no long-range magnetic order down to 0.4 K at zero field. The temperature dependent magnetization, M (T ), reveals an easy-plane magnetic anisotropy. A maximum is found in M (T ) around T ∼1.5 K when magnetic field H is applied in the ab plane, indicating the short-range interaction. The low-temperature isothermal magnetization M (H) shows a one-third plateau of the estimated saturation moment, that is characteristic of a two-dimensional frustrated triangular lattice. Heat capacity shows field-induced long-range magnetic order for both H||c and H||ab directions. The broad peak in heat capacity and highly damped INS magnetic excitation at T =2 K suggests strong spin fluctuations. The dispersive in-plane INS, centered at the (1/3 1/3 0) point, and the absence of dispersion along c direction suggests 120 • non-collinear 2D-like spin correlations. All these results indicate that the two-dimensional frustrated material CsYbSe2 can be in proximity to the triangularlattice quantum spin liquid. We propose an experimental low-temperature H-T phase diagram for CsYbSe2.

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“…Because of the exact analytical solution of its ground state and excitations, the Kitaev model 2 is one of the most studied theoretical models of a QSL. Recent experimental and theoretical studies have converged onto a few real systems that could host this model [7][8][9][10][11][12][13][14][15][16][17] , including α-RuCl 3 and the iridate family of A 2 IrO 3 . In these systems, strong spin-orbit coupling, which leads to J ef f = 1/2, and the honeycomb lattice of the edge-sharing IrO 6 and RuCl 6 octahedra give rise to effective bond-dependent exchange interaction of the Kitaev model 18,19 .…”

Section: Introductionmentioning

confidence: 99%

Polarization-resolved Raman spectroscopy of α−RuCl3 and evidence of room-temperature two-dimensional magnetic scattering

et al. 2019

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Polarization-resolved Raman spectroscopy was performed and analyzed from large, high quality, mono-domain single crystal of α-RuCl 3 , a proximate Kitaev quantum spin liquid. Spectra were collected with laser polarizations parallel and perpendicular to the honeycomb plane. Pairs of nearly degenerate phonons were discovered and show either a 4-fold or 2-fold polarization angle dependence in their Raman intensity, thereby providing evidence to definitively assign the bulk crystal point group as C 2h . The low frequency continuum that is often attributed to scattering from pairs of Majorana fermions was also examined and found to disappear when the laser excitation and scattered photon polarizations were perpendicular to the honeycomb plane. This disappearance, along with the behavior of the phonon spectrum in the same polarization configuration, strongly suggests that the scattering continuum is 2-dimensional. We argue that this scattering continuum originates from the Kitaev magnetic interactions that survives up to room temperature, a scale larger than the bare Kitaev exchange energy of approximately 50 K.

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Spin-Wave Excitations Evidencing the Kitaev Interaction in Single Crystalline α−RuCl3

Cited by 191 publications

References 51 publications

Magnetic field-dependent low-energy magnon dynamics in α–RuCl3

Magnetic field-dependent low-energy magnon dynamics in α–RuCl3

Field-induced magnetic transition and spin fluctuations in the quantum spin-liquid candidate CsYbSe2

Polarization-resolved Raman spectroscopy of α−RuCl3 and evidence of room-temperature two-dimensional magnetic scattering

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